diff --git a/layout/base/nsIPresShell.h b/layout/base/nsIPresShell.h
index 33354bd14482..7dfe22905bcd 100644
--- a/layout/base/nsIPresShell.h
+++ b/layout/base/nsIPresShell.h
@@ -121,10 +121,10 @@ typedef struct CapturingContentInfo {
   nsIContent* mContent;
 } CapturingContentInfo;
 
-// bf539e0a-c314-4ea7-ba7c-ebd34e8a4065
+// fac033dd-938d-45bc-aaa5-dc2fa7ef5a40
 #define NS_IPRESSHELL_IID \
-{ 0xbf539e0a, 0xc314, 0x4ea7, \
-  { 0xba, 0x7c, 0xeb, 0xd3, 0x4e, 0x8a, 0x40, 0x65 } }
+{ 0xfac033dd, 0x938d, 0x45bc, \
+  { 0xaa, 0xa5, 0xdc, 0x2f, 0xa7, 0xef, 0x5a, 0x40 } }
 
 // debug VerifyReflow flags
 #define VERIFY_REFLOW_ON                    0x01
@@ -411,11 +411,6 @@ public:
    */
   virtual bool IsLayoutFlushObserver() = 0;
 
-  /**
-   * Reflow the frame model with a reflow reason of eReflowReason_StyleChange
-   */
-  virtual NS_HIDDEN_(void) StyleChangeReflow() = 0;
-
   /**
    * This calls through to the frame manager to get the root frame.
    */
diff --git a/layout/base/nsPresShell.cpp b/layout/base/nsPresShell.cpp
index 0e25882a2549..20609b6126f2 100644
--- a/layout/base/nsPresShell.cpp
+++ b/layout/base/nsPresShell.cpp
@@ -2314,19 +2314,6 @@ PresShell::CheckVisibilityContent(nsIContent* aNode, int16_t aStartOffset,
 
 //end implementations nsISelectionController
 
-
-void
-PresShell::StyleChangeReflow()
-{
-  nsIFrame* rootFrame = mFrameConstructor->GetRootFrame();
-  // At the moment at least, we don't have a root frame before the initial
-  // reflow; it's safe to just ignore the request in that case
-  if (!rootFrame)
-    return;
-
-  FrameNeedsReflow(rootFrame, eStyleChange, NS_FRAME_IS_DIRTY);
-}
-
 nsIFrame*
 nsIPresShell::GetRootFrameExternal() const
 {
diff --git a/layout/base/nsPresShell.h b/layout/base/nsPresShell.h
index 7af438bf5a43..2ab9a369d42d 100644
--- a/layout/base/nsPresShell.h
+++ b/layout/base/nsPresShell.h
@@ -89,7 +89,6 @@ public:
   virtual NS_HIDDEN_(nsresult) Initialize(nscoord aWidth, nscoord aHeight);
   virtual NS_HIDDEN_(nsresult) ResizeReflow(nscoord aWidth, nscoord aHeight);
   virtual NS_HIDDEN_(nsresult) ResizeReflowOverride(nscoord aWidth, nscoord aHeight);
-  virtual NS_HIDDEN_(void) StyleChangeReflow();
   virtual NS_HIDDEN_(nsIPageSequenceFrame*) GetPageSequenceFrame() const;
   virtual NS_HIDDEN_(nsIFrame*) GetRealPrimaryFrameFor(nsIContent* aContent) const;