diff --git a/widget/public/nsIWidget.h b/widget/public/nsIWidget.h
index 317832e9ef4a..6ed9abbde4aa 100644
--- a/widget/public/nsIWidget.h
+++ b/widget/public/nsIWidget.h
@@ -665,12 +665,6 @@ class nsIWidget : public nsISupports {
      */
     NS_IMETHOD MakeFullScreen(PRBool aFullScreen) = 0;
 
-    /**
-     * Validate the widget.
-     *
-     */
-    NS_IMETHOD Validate() = 0;
-
     /**
      * Invalidate the widget and repaint it.
      *
diff --git a/widget/src/cocoa/nsChildView.h b/widget/src/cocoa/nsChildView.h
index f988aaa5282c..b28693e6b3b5 100644
--- a/widget/src/cocoa/nsChildView.h
+++ b/widget/src/cocoa/nsChildView.h
@@ -341,7 +341,6 @@ public:
 
   NS_IMETHOD              Invalidate(PRBool aIsSynchronous);
   NS_IMETHOD              Invalidate(const nsIntRect &aRect, PRBool aIsSynchronous);
-  NS_IMETHOD              Validate();
 
   virtual void*           GetNativeData(PRUint32 aDataType);
   virtual nsresult        ConfigureChildren(const nsTArray<Configuration>& aConfigurations);
diff --git a/widget/src/cocoa/nsChildView.mm b/widget/src/cocoa/nsChildView.mm
index 9c242107310d..b7df13f4544e 100644
--- a/widget/src/cocoa/nsChildView.mm
+++ b/widget/src/cocoa/nsChildView.mm
@@ -1659,17 +1659,6 @@ NS_IMETHODIMP nsChildView::Invalidate(const nsIntRect &aRect, PRBool aIsSynchron
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 
-// Validate the widget
-NS_IMETHODIMP nsChildView::Validate()
-{
-  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
-
-  [mView setNeedsDisplay:NO];
-  return NS_OK;
-
-  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
-}
-
 inline PRUint16 COLOR8TOCOLOR16(PRUint8 color8)
 {
   // return (color8 == 0xFF ? 0xFFFF : (color8 << 8));
diff --git a/widget/src/gtk2/nsWindow.cpp b/widget/src/gtk2/nsWindow.cpp
index b7ca40f9e756..026683ff1be7 100644
--- a/widget/src/gtk2/nsWindow.cpp
+++ b/widget/src/gtk2/nsWindow.cpp
@@ -1680,23 +1680,6 @@ nsWindow::SetCursor(imgIContainer* aCursor,
     return rv;
 }
 
-
-NS_IMETHODIMP
-nsWindow::Validate()
-{
-    // Get the update for this window and, well, just drop it on the
-    // floor.
-    if (!mGdkWindow)
-        return NS_OK;
-
-    GdkRegion *region = gdk_window_get_update_area(mGdkWindow);
-
-    if (region)
-        gdk_region_destroy(region);
-
-    return NS_OK;
-}
-
 NS_IMETHODIMP
 nsWindow::Invalidate(PRBool aIsSynchronous)
 {
diff --git a/widget/src/gtk2/nsWindow.h b/widget/src/gtk2/nsWindow.h
index 483bca34037c..d15b313b1f9f 100644
--- a/widget/src/gtk2/nsWindow.h
+++ b/widget/src/gtk2/nsWindow.h
@@ -181,7 +181,6 @@ public:
     NS_IMETHOD         SetCursor(nsCursor aCursor);
     NS_IMETHOD         SetCursor(imgIContainer* aCursor,
                                  PRUint32 aHotspotX, PRUint32 aHotspotY);
-    NS_IMETHOD         Validate();
     NS_IMETHOD         Invalidate(PRBool aIsSynchronous);
     NS_IMETHOD         Invalidate(const nsIntRect &aRect,
                                   PRBool           aIsSynchronous);
diff --git a/widget/src/qt/nsWindow.cpp b/widget/src/qt/nsWindow.cpp
index 4ea612820193..71e14210f6c6 100644
--- a/widget/src/qt/nsWindow.cpp
+++ b/widget/src/qt/nsWindow.cpp
@@ -634,20 +634,6 @@ nsWindow::SetCursor(imgIContainer* aCursor,
     return rv;
 }
 
-
-NS_IMETHODIMP
-nsWindow::Validate()
-{
-    // Get the update for this window and, well, just drop it on the
-    // floor.
-    if (!mWidget)
-        return NS_OK;
-
-    qDebug("FIXME:>>>>>>Func:%s::%d\n", __PRETTY_FUNCTION__, __LINE__);
-
-    return NS_OK;
-}
-
 NS_IMETHODIMP
 nsWindow::Invalidate(PRBool aIsSynchronous)
 {
diff --git a/widget/src/qt/nsWindow.h b/widget/src/qt/nsWindow.h
index d616b147467d..7aff34daddad 100644
--- a/widget/src/qt/nsWindow.h
+++ b/widget/src/qt/nsWindow.h
@@ -165,7 +165,6 @@ public:
     NS_IMETHOD         GetHasTransparentBackground(PRBool& aTransparent);
     NS_IMETHOD         HideWindowChrome(PRBool aShouldHide);
     NS_IMETHOD         MakeFullScreen(PRBool aFullScreen);
-    NS_IMETHOD         Validate();
     NS_IMETHOD         Invalidate(PRBool aIsSynchronous);
     NS_IMETHOD         Invalidate(const nsIntRect &aRect,
                                   PRBool        aIsSynchronous);
diff --git a/widget/src/windows/nsWindow.cpp b/widget/src/windows/nsWindow.cpp
index aec05b76f1e4..cb07e0c5f107 100644
--- a/widget/src/windows/nsWindow.cpp
+++ b/widget/src/windows/nsWindow.cpp
@@ -1999,20 +1999,12 @@ NS_IMETHODIMP nsWindow::HideWindowChrome(PRBool aShouldHide)
 
 /**************************************************************
  *
- * SECTION: nsIWidget::Validate, nsIWidget::Invalidate
+ * SECTION: nsIWidget::Invalidate
  *
- * Validate or invalidate an area of the client for painting.
+ * Invalidate an area of the client for painting.
  *
  **************************************************************/
 
-// Validate a visible area of a widget.
-NS_METHOD nsWindow::Validate()
-{
-  if (mWnd)
-    VERIFY(::ValidateRect(mWnd, NULL));
-  return NS_OK;
-}
-
 #ifdef WINCE_WINDOWS_MOBILE
 static inline void AddRECTToRegion(const RECT& aRect, nsIRegion* aRegion)
 {
diff --git a/widget/src/windows/nsWindow.h b/widget/src/windows/nsWindow.h
index 1788164d4ae5..b4a56160c4d2 100644
--- a/widget/src/windows/nsWindow.h
+++ b/widget/src/windows/nsWindow.h
@@ -139,7 +139,6 @@ public:
   virtual nsresult        ConfigureChildren(const nsTArray<Configuration>& aConfigurations);
   NS_IMETHOD              MakeFullScreen(PRBool aFullScreen);
   NS_IMETHOD              HideWindowChrome(PRBool aShouldHide);
-  NS_IMETHOD              Validate();
   NS_IMETHOD              Invalidate(PRBool aIsSynchronous);
   NS_IMETHOD              Invalidate(const nsIntRect & aRect, PRBool aIsSynchronous);
   NS_IMETHOD              Update();
diff --git a/widget/src/xpwidgets/nsBaseWidget.cpp b/widget/src/xpwidgets/nsBaseWidget.cpp
index 9d22a69298bb..1101f7ccc3af 100644
--- a/widget/src/xpwidgets/nsBaseWidget.cpp
+++ b/widget/src/xpwidgets/nsBaseWidget.cpp
@@ -214,11 +214,6 @@ NS_IMETHODIMP nsBaseWidget::CaptureMouse(PRBool aCapture)
   return NS_OK;
 }
 
-NS_IMETHODIMP nsBaseWidget::Validate()
-{
-  return NS_OK;
-}
-
 //-------------------------------------------------------------------------
 //
 // Accessor functions to get/set the client data
diff --git a/widget/src/xpwidgets/nsBaseWidget.h b/widget/src/xpwidgets/nsBaseWidget.h
index 557d3a32abfa..b79137faed6d 100644
--- a/widget/src/xpwidgets/nsBaseWidget.h
+++ b/widget/src/xpwidgets/nsBaseWidget.h
@@ -74,7 +74,6 @@ public:
   
   // nsIWidget interface
   NS_IMETHOD              CaptureMouse(PRBool aCapture);
-  NS_IMETHOD              Validate();
   NS_IMETHOD              GetClientData(void*& aClientData);
   NS_IMETHOD              SetClientData(void* aClientData);
   NS_IMETHOD              Destroy();