Bug 882573 patch 1: Move the style attribute style sheet from nsDocument to nsIDocument, and devirtualize its getter. r=bzbarsky

content/base/public/nsIDocument.h

@@ -766,7 +766,9 @@ public:
    * Get this document's inline style sheet.  May return null if there
    * isn't one
    */
-  virtual nsHTMLCSSStyleSheet* GetInlineStyleSheet() const = 0;
+  nsHTMLCSSStyleSheet* GetInlineStyleSheet() const {
+    return mStyleAttrStyleSheet;
+  }
 
   /**
    * Get/set the object from which a document can get a script context
@@ -2178,6 +2180,7 @@ protected:
   nsRefPtr<mozilla::css::Loader> mCSSLoader;
   nsRefPtr<mozilla::css::ImageLoader> mStyleImageLoader;
   nsRefPtr<nsHTMLStyleSheet> mAttrStyleSheet;
+  nsRefPtr<nsHTMLCSSStyleSheet> mStyleAttrStyleSheet;
 
   // The set of all object, embed, applet, video and audio elements for
   // which this is the owner document. (They might not be in the document.)

content/base/src/nsDocument.h

@@ -641,14 +641,6 @@ public:
     return mChannel;
   }
 
-  /**
-   * Get this document's inline style sheet.  May return null if there
-   * isn't one
-   */
-  virtual nsHTMLCSSStyleSheet* GetInlineStyleSheet() const MOZ_OVERRIDE {
-    return mStyleAttrStyleSheet;
-  }
-  
   /**
    * Set the object from which a document can get a script context.
    * This is the context within which all scripts (during document
@@ -1308,7 +1300,6 @@ protected:
 
   // The channel that got passed to StartDocumentLoad(), if any
   nsCOMPtr<nsIChannel> mChannel;
-  nsRefPtr<nsHTMLCSSStyleSheet> mStyleAttrStyleSheet;
 
   // A document "without a browsing context" that owns the content of
   // HTMLTemplateElement.