diff --git a/widget/src/cocoa/nsMenuBarX.cpp b/widget/src/cocoa/nsMenuBarX.cpp
index a89502ab63a3..05295b0148e1 100644
--- a/widget/src/cocoa/nsMenuBarX.cpp
+++ b/widget/src/cocoa/nsMenuBarX.cpp
@@ -726,6 +726,10 @@ NS_METHOD nsMenuBarX::Paint()
 // this is needed for menubar changes
 //
 
+NS_IMPL_NSIDOCUMENTOBSERVER_LOAD_STUB(nsMenuBarX)
+NS_IMPL_NSIDOCUMENTOBSERVER_REFLOW_STUB(nsMenuBarX)
+NS_IMPL_NSIDOCUMENTOBSERVER_STATE_STUB(nsMenuBarX)
+NS_IMPL_NSIDOCUMENTOBSERVER_STYLE_STUB(nsMenuBarX)
 
 NS_IMETHODIMP
 nsMenuBarX::BeginUpdate( nsIDocument * aDocument )
@@ -739,43 +743,12 @@ nsMenuBarX::EndUpdate( nsIDocument * aDocument )
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsMenuBarX::BeginLoad( nsIDocument * aDocument )
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::EndLoad( nsIDocument * aDocument )
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::BeginReflow(  nsIDocument * aDocument, nsIPresShell * aShell)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::EndReflow( nsIDocument * aDocument, nsIPresShell * aShell)
-{
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsMenuBarX::ContentChanged( nsIDocument * aDocument, nsIContent * aContent, nsISupports * aSubContent)
 {
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsMenuBarX::ContentStatesChanged( nsIDocument * aDocument, nsIContent  * aContent1,
-                                  nsIContent  * aContent2, PRInt32 aStateMask)
-{
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsMenuBarX::ContentAppended( nsIDocument * aDocument, nsIContent  * aContainer,
                               PRInt32 aNewIndexInContainer)
@@ -809,46 +782,6 @@ nsMenuBarX::ContentReplaced( nsIDocument * aDocument, nsIContent * aContainer, n
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsMenuBarX::StyleSheetAdded( nsIDocument * aDocument, nsIStyleSheet * aStyleSheet)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::StyleSheetRemoved(nsIDocument * aDocument, nsIStyleSheet * aStyleSheet)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::StyleSheetDisabledStateChanged(nsIDocument * aDocument, nsIStyleSheet * aStyleSheet,
-                                            PRBool aDisabled)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::StyleRuleChanged( nsIDocument * aDocument, nsIStyleSheet * aStyleSheet,
-                              nsIStyleRule * aStyleRule, nsChangeHint aHint)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::StyleRuleAdded( nsIDocument * aDocument, nsIStyleSheet * aStyleSheet,
-                            nsIStyleRule * aStyleRule)
-{
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsMenuBarX::StyleRuleRemoved(nsIDocument * aDocument, nsIStyleSheet * aStyleSheet,
-                              nsIStyleRule  * aStyleRule)
-{
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsMenuBarX::DocumentWillBeDestroyed( nsIDocument * aDocument )
 {
diff --git a/widget/src/cocoa/nsMenuBarX.h b/widget/src/cocoa/nsMenuBarX.h
index 6bf919208d2e..dbd21e787ded 100644
--- a/widget/src/cocoa/nsMenuBarX.h
+++ b/widget/src/cocoa/nsMenuBarX.h
@@ -101,59 +101,7 @@ public:
     nsEventStatus SetRebuild(PRBool aMenuEvent);
 
     // nsIDocumentObserver
-    NS_IMETHOD BeginUpdate(nsIDocument *aDocument);
-    NS_IMETHOD EndUpdate(nsIDocument *aDocument);
-    NS_IMETHOD BeginLoad(nsIDocument *aDocument);
-    NS_IMETHOD EndLoad(nsIDocument *aDocument);
-    NS_IMETHOD BeginReflow(nsIDocument *aDocument, nsIPresShell* aShell);
-    NS_IMETHOD EndReflow(nsIDocument *aDocument, nsIPresShell* aShell);
-    NS_IMETHOD ContentChanged(nsIDocument *aDocument,
-                              nsIContent* aContent,
-                              nsISupports* aSubContent);
-    NS_IMETHOD ContentStatesChanged(nsIDocument *aDocument,
-                                    nsIContent* aContent1,
-                                    nsIContent* aContent2,
-                                    PRInt32 aStateMask);
-    NS_IMETHOD AttributeChanged(nsIDocument *aDocument,
-                                nsIContent*  aContent,
-                                PRInt32      aNameSpaceID,
-                                nsIAtom*     aAttribute,
-                                PRInt32      aModType, 
-                                nsChangeHint aHint);
-    NS_IMETHOD ContentAppended(nsIDocument *aDocument,
-                               nsIContent* aContainer,
-                               PRInt32     aNewIndexInContainer);
-    NS_IMETHOD ContentInserted(nsIDocument *aDocument,
-                               nsIContent* aContainer,
-                               nsIContent* aChild,
-                               PRInt32 aIndexInContainer);
-    NS_IMETHOD ContentReplaced(nsIDocument *aDocument,
-                               nsIContent* aContainer,
-                               nsIContent* aOldChild,
-                               nsIContent* aNewChild,
-                               PRInt32 aIndexInContainer);
-    NS_IMETHOD ContentRemoved(nsIDocument *aDocument,
-                              nsIContent* aContainer,
-                              nsIContent* aChild,
-                              PRInt32 aIndexInContainer);
-    NS_IMETHOD StyleSheetAdded(nsIDocument *aDocument,
-                             nsIStyleSheet* aStyleSheet);
-    NS_IMETHOD StyleSheetRemoved(nsIDocument *aDocument,
-                               nsIStyleSheet* aStyleSheet);
-    NS_IMETHOD StyleSheetDisabledStateChanged(nsIDocument *aDocument,
-                                              nsIStyleSheet* aStyleSheet,
-                                              PRBool aDisabled);
-    NS_IMETHOD StyleRuleChanged(nsIDocument *aDocument,
-                                nsIStyleSheet* aStyleSheet,
-                                nsIStyleRule* aStyleRule,
-                                nsChangeHint aHint);
-    NS_IMETHOD StyleRuleAdded(nsIDocument *aDocument,
-                              nsIStyleSheet* aStyleSheet,
-                              nsIStyleRule* aStyleRule);
-    NS_IMETHOD StyleRuleRemoved(nsIDocument *aDocument,
-                                nsIStyleSheet* aStyleSheet,
-                                nsIStyleRule* aStyleRule);
-    NS_IMETHOD DocumentWillBeDestroyed(nsIDocument *aDocument);
+    NS_DECL_NSIDOCUMENTOBSERVER
 
     NS_IMETHOD Create(nsIWidget * aParent);