Introduce RenderFrame::IsMainFrame and clean up a few things.

content/public/renderer/content_renderer_client.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 #define CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 58 matching lines @@
 struct WebPluginInfo;
 
 // Embedder API for participating in renderer logic.
 class CONTENT_EXPORT ContentRendererClient {
  public:
   virtual ~ContentRendererClient() {}
 
   // Notifies us that the RenderThread has been created.
   virtual void RenderThreadStarted() {}
 
-  // Notifies that a new RenderFrame has been created. Note that at this point,
-  // render_frame->GetWebFrame()->parent() is always NULL. This will change once
-  // the frame tree moves from Blink to content.
+  // Notifies that a new RenderFrame has been created.
   virtual void RenderFrameCreated(RenderFrame* render_frame) {}
 
   // Notifies that a new RenderView has been created.
   virtual void RenderViewCreated(RenderView* render_view) {}
 
   // Returns the bitmap to show when a plugin crashed, or NULL for none.
   virtual SkBitmap* GetSadPluginBitmap();
 
   // Returns the bitmap to show when a <webview> guest has crashed, or NULL for
   // none.
@@ skipping 212 matching lines @@
   // Notifies that a service worker context will be destroyed. This function
   // is called from the worker thread.
   virtual void WillDestroyServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
       const GURL& url) {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_CONTENT_RENDERER_CLIENT_H_