Bug 1444580: Devirtualize IsScriptEnabled. r=smaug

MozReview-Commit-ID: FEhddLUXnO4

dom/base/nsDocument.cpp

@@ -7696,7 +7696,7 @@ nsDocument::GetXMLDeclaration(nsAString& aVersion, nsAString& aEncoding,
 }
 
 bool
-nsDocument::IsScriptEnabled()
+nsIDocument::IsScriptEnabled()
 {
   // If this document is sandboxed without 'allow-scripts'
   // script is not enabled

dom/base/nsDocument.h

@@ -413,7 +413,6 @@ public:
   virtual void GetXMLDeclaration(nsAString& aVersion,
                                  nsAString& aEncoding,
                                  nsAString& Standalone) override;
-  virtual bool IsScriptEnabled() override;
 
   virtual void OnPageShow(bool aPersisted, mozilla::dom::EventTarget* aDispatchStartTarget) override;
   virtual void OnPageHide(bool aPersisted, mozilla::dom::EventTarget* aDispatchStartTarget) override;

dom/base/nsIDocument.h

@@ -1899,7 +1899,7 @@ public:
     return IsXULDocument() || AllowXULXBL();
   }
 
-  virtual bool IsScriptEnabled() = 0;
+  bool IsScriptEnabled();
 
   bool IsTopLevelContentDocument() const { return mIsTopLevelContentDocument; }
   void SetIsTopLevelContentDocument(bool aIsTopLevelContentDocument)