--- a/layout/style/GroupRule.h
+++ b/layout/style/GroupRule.h
@@ -70,16 +70,17 @@ protected:
 public:
 
   // Implement part of nsISupports.
   NS_IMETHOD_(nsrefcnt) AddRef();
   NS_IMETHOD_(nsrefcnt) Release();
 
   // implement part of nsIStyleRule and nsICSSRule
   DECL_STYLE_RULE_INHERIT_NO_DOMRULE
+  virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
 
   // to help implement nsIStyleRule
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
 #endif
 
 public:
   void AppendStyleRule(nsICSSRule* aRule);

--- a/layout/style/ImportRule.h
+++ b/layout/style/ImportRule.h
@@ -59,16 +59,20 @@ private:
   // for |Clone|
   ImportRule(const ImportRule& aCopy);
   ~ImportRule();
 public:
   NS_DECL_ISUPPORTS
 
   DECL_STYLE_RULE_INHERIT
 
+#ifdef HAVE_CPP_AMBIGUITY_RESOLVING_USING
+  using nsCSSRule::GetStyleSheet; // unhide since nsIDOMCSSImportRule has its own GetStyleSheet
+#endif
+
   // nsIStyleRule methods
 #ifdef DEBUG
   virtual void List(FILE* out = stdout, PRInt32 aIndent = 0) const;
 #endif
 
   // nsICSSRule methods
   virtual PRInt32 GetType() const;
   virtual already_AddRefed<nsICSSRule> Clone() const;

--- a/layout/style/StyleRule.cpp
+++ b/layout/style/StyleRule.cpp
@@ -1371,35 +1371,16 @@ StyleRule::RuleMatched()
     mWasMatched = PR_TRUE;
     mDeclaration->SetImmutable();
     if (mDeclaration->HasImportantData()) {
       NS_ADDREF(mImportantRule = new ImportantRule(mDeclaration));
     }
   }
 }
 
-/* virtual */ already_AddRefed<nsIStyleSheet>
-StyleRule::GetStyleSheet() const
-{
-// XXX What about inner, etc.
-  return nsCSSRule::GetStyleSheet();
-}
-
-/* virtual */ void
-StyleRule::SetStyleSheet(nsCSSStyleSheet* aSheet)
-{
-  nsCSSRule::SetStyleSheet(aSheet);
-}
-
-/* virtual */ void
-StyleRule::SetParentRule(GroupRule* aRule)
-{
-  nsCSSRule::SetParentRule(aRule);
-}
-
 /* virtual */ PRInt32
 StyleRule::GetType() const
 {
   return nsICSSRule::STYLE_RULE;
 }
 
 /* virtual */ already_AddRefed<nsICSSRule>
 StyleRule::Clone() const

--- a/layout/style/StyleRule.h
+++ b/layout/style/StyleRule.h
@@ -343,20 +343,16 @@ public:
   void SetCssText(const nsAString& aCssText);
   nsCSSStyleSheet* GetParentStyleSheet() { return mSheet; }
   GroupRule* GetParentRule() { return mParentRule; }
   void GetSelectorText(nsAString& aSelectorText);
   void SetSelectorText(const nsAString& aSelectorText);
 
   virtual PRInt32 GetType() const;
 
-  virtual already_AddRefed<nsIStyleSheet> GetStyleSheet() const;
-  virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
-  virtual void SetParentRule(GroupRule* aRule);
-
   virtual already_AddRefed<nsICSSRule> Clone() const;
 
   nsIDOMCSSRule* GetDOMRuleWeak(nsresult* aResult);
 
   // The new mapping function.
   virtual void MapRuleInfoInto(nsRuleData* aRuleData);
 
 #ifdef DEBUG

--- a/layout/style/nsCSSRule.h
+++ b/layout/style/nsCSSRule.h
@@ -49,19 +49,16 @@ template<class T> struct already_AddRefe
 
 namespace mozilla {
 namespace css {
 class GroupRule;
 }
 }
 
 #define DECL_STYLE_RULE_INHERIT_NO_DOMRULE  \
-virtual already_AddRefed<nsIStyleSheet> GetStyleSheet() const; \
-virtual void SetStyleSheet(nsCSSStyleSheet* aSheet); \
-virtual void SetParentRule(mozilla::css::GroupRule* aRule); \
 virtual void MapRuleInfoInto(nsRuleData* aRuleData);
 
 #define DECL_STYLE_RULE_INHERIT  \
 DECL_STYLE_RULE_INHERIT_NO_DOMRULE \
 virtual nsIDOMCSSRule* GetDOMRuleWeak(nsresult* aResult);
 
 class nsCSSRule : public nsICSSRule {
 protected:

--- a/layout/style/nsCSSRules.cpp
+++ b/layout/style/nsCSSRules.cpp
@@ -66,25 +66,20 @@
 #include "nsDOMError.h"
 #include "nsStyleUtil.h"
 #include "mozilla/css/Declaration.h"
 #include "nsPrintfCString.h"
 
 namespace css = mozilla::css;
 
 #define IMPL_STYLE_RULE_INHERIT(_class, super) \
-/* virtual */ already_AddRefed<nsIStyleSheet> _class::GetStyleSheet() const { return super::GetStyleSheet(); }  \
-/* virtual */ void _class::SetStyleSheet(nsCSSStyleSheet* aSheet) { super::SetStyleSheet(aSheet); }  \
-/* virtual */ void _class::SetParentRule(css::GroupRule* aRule) { super::SetParentRule(aRule); }  \
 nsIDOMCSSRule* _class::GetDOMRuleWeak(nsresult *aResult) { *aResult = NS_OK; return this; }  \
 /* virtual */ void _class::MapRuleInfoInto(nsRuleData* aRuleData) { }
 
 #define IMPL_STYLE_RULE_INHERIT2(_class, super) \
-/* virtual */ already_AddRefed<nsIStyleSheet> _class::GetStyleSheet() const { return super::GetStyleSheet(); }  \
-/* virtual */ void  _class::SetParentRule(css::GroupRule* aRule) { super::SetParentRule(aRule); }  \
 /* virtual */ void _class::MapRuleInfoInto(nsRuleData* aRuleData) { }
 
 
 // base class for all rule types in a CSS style sheet
 
 /* virtual */ already_AddRefed<nsIStyleSheet>
 nsCSSRule::GetStyleSheet() const
 {