Prepare for per frame did{Start,Stop}Loading calls

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 90978fb55f9b0e837abac0bc8d0daded2d27535e..6d26cbbf0eddd1d63dcca54ec6198442e9b45267 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -406,10 +406,12 @@ class CONTENT_EXPORT RenderViewImpl
   virtual bool enumerateChosenDirectory(
       const blink::WebString& path,
       blink::WebFileChooserCompletion* chooser_completion);
+  // DEPRECATED
   virtual void didStartLoading(bool to_different_document);
   // DEPRECATED
-  virtual void didStartLoading();
   virtual void didStopLoading();
+  virtual void didStartLoading(blink::WebFrame* frame);
+  virtual void didStopLoading(blink::WebFrame* frame);
   virtual void didChangeLoadProgress(blink::WebFrame* frame,
                                      double load_progress);
   virtual void didCancelCompositionOnSelectionChange();
@@ -1133,9 +1135,6 @@ class CONTENT_EXPORT RenderViewImpl
 
   // Loading state -------------------------------------------------------------
 
-  // True if the top level frame is currently being loaded.
-  bool is_loading_;
-
   // The gesture that initiated the current navigation.
   // TODO(nasko): Move to RenderFrame, as this is per-frame state.
   NavigationGesture navigation_gesture_;