diff --git a/content/xslt/src/xpath/nsXPathResult.cpp b/content/xslt/src/xpath/nsXPathResult.cpp
index 36c4fddee61e..441b95501672 100644
--- a/content/xslt/src/xpath/nsXPathResult.cpp
+++ b/content/xslt/src/xpath/nsXPathResult.cpp
@@ -205,6 +205,11 @@ nsXPathResult::SnapshotItem(PRUint32 aIndex, nsIDOMNode **aResult)
     return NS_OK;
 }
 
+NS_IMPL_NSIDOCUMENTOBSERVER_LOAD_STUB(nsXPathResult)
+NS_IMPL_NSIDOCUMENTOBSERVER_REFLOW_STUB(nsXPathResult)
+NS_IMPL_NSIDOCUMENTOBSERVER_STYLE_STUB(nsXPathResult)
+NS_IMPL_NSIDOCUMENTOBSERVER_STATE_STUB(nsXPathResult)
+
 NS_IMETHODIMP
 nsXPathResult::BeginUpdate(nsIDocument* aDocument)
 {
@@ -217,32 +222,6 @@ nsXPathResult::EndUpdate(nsIDocument* aDocument)
     return NS_OK;
 }
 
-NS_IMETHODIMP
-nsXPathResult::BeginLoad(nsIDocument* aDocument)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::EndLoad(nsIDocument* aDocument)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::BeginReflow(nsIDocument* aDocument,
-                           nsIPresShell* aShell)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::EndReflow(nsIDocument* aDocument,
-                         nsIPresShell* aShell)
-{
-    return NS_OK;
-}
-
 NS_IMETHODIMP
 nsXPathResult::ContentChanged(nsIDocument* aDocument,
                               nsIContent *aContent,
@@ -251,15 +230,6 @@ nsXPathResult::ContentChanged(nsIDocument* aDocument,
     return NS_OK;
 }
 
-NS_IMETHODIMP
-nsXPathResult::ContentStatesChanged(nsIDocument* aDocument,
-                                    nsIContent* aContent1,
-                                    nsIContent* aContent2,
-                                    PRInt32 aStateMask)
-{
-    return NS_OK;
-}
-
 NS_IMETHODIMP
 nsXPathResult::AttributeChanged(nsIDocument* aDocument,
                                 nsIContent* aContent,
@@ -312,53 +282,6 @@ nsXPathResult::ContentRemoved(nsIDocument* aDocument,
     return NS_OK;
 }
 
-NS_IMETHODIMP
-nsXPathResult::StyleSheetAdded(nsIDocument* aDocument,
-                               nsIStyleSheet* aStyleSheet)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::StyleSheetRemoved(nsIDocument* aDocument,
-                                 nsIStyleSheet* aStyleSheet)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::StyleSheetDisabledStateChanged(nsIDocument* aDocument,
-                                              nsIStyleSheet* aStyleSheet,
-                                              PRBool aDisabled)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::StyleRuleChanged(nsIDocument* aDocument,
-                                nsIStyleSheet* aStyleSheet,
-                                nsIStyleRule* aStyleRule,
-                                nsChangeHint aHint)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::StyleRuleAdded(nsIDocument* aDocument,
-                              nsIStyleSheet* aStyleSheet,
-                              nsIStyleRule* aStyleRule)
-{
-    return NS_OK;
-}
-
-NS_IMETHODIMP
-nsXPathResult::StyleRuleRemoved(nsIDocument* aDocument,
-                                nsIStyleSheet* aStyleSheet,
-                                nsIStyleRule* aStyleRule)
-{
-    return NS_OK;
-}
-
 NS_IMETHODIMP
 nsXPathResult::DocumentWillBeDestroyed(nsIDocument* aDocument)
 {
diff --git a/content/xslt/src/xpath/nsXPathResult.h b/content/xslt/src/xpath/nsXPathResult.h
index 6c251a339536..3c0d8ccc5fc0 100644
--- a/content/xslt/src/xpath/nsXPathResult.h
+++ b/content/xslt/src/xpath/nsXPathResult.h
@@ -79,61 +79,7 @@ public:
     NS_DECL_NSIDOMXPATHRESULT
 
     // nsIDocumentObserver interface
-    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
 
     // nsIXPathResult interface
     NS_IMETHOD SetExprResult(ExprResult* aExprResult,