1 files changed, 8 insertions, 0 deletions
diff --git a/layout/style/nsCSSRules.h b/layout/style/nsCSSRules.h
index daefaf3f9..1bd468cb6 100644
--- a/layout/style/nsCSSRules.h
+++ b/layout/style/nsCSSRules.h
@@ -39,6 +39,11 @@ class nsMediaList;
 
 namespace mozilla {
 
+namespace dom {
+class DocGroup;
+class DocGroup;
+} // namespace dom
+
 class ErrorResult;
 
 namespace css {
@@ -209,6 +214,7 @@ public:
   using nsICSSDeclaration::GetPropertyCSSValue;
 
   virtual nsINode *GetParentObject() override;
+  virtual mozilla::dom::DocGroup* GetDocGroup() const override;
   virtual void IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aPropName) override;
 
   nsresult GetPropertyValue(nsCSSFontDesc aFontDescID,
@@ -366,6 +372,7 @@ public:
                                                          nsICSSDeclaration)
 
   virtual nsINode* GetParentObject() override;
+  virtual mozilla::dom::DocGroup* GetDocGroup() const override;
 
 protected:
   virtual ~nsCSSKeyframeStyleDeclaration();
@@ -496,6 +503,7 @@ public:
                                                          nsICSSDeclaration)
 
   virtual nsINode *GetParentObject() override;
+  virtual mozilla::dom::DocGroup* GetDocGroup() const override;
 
 protected:
   virtual ~nsCSSPageStyleDeclaration();