Add IPC::Sender and GetRoutingID() to WebContents for convenience and safety.

content/browser/web_contents/web_contents_impl.h

Index: content/browser/web_contents/web_contents_impl.h
diff --git a/content/browser/web_contents/web_contents_impl.h b/content/browser/web_contents/web_contents_impl.h
index 8d550438fa12b6ff1af50c75f9e2f6d47c924858..b9320aed69ec0249a25201e11d8e3332633fd307 100644
--- a/content/browser/web_contents/web_contents_impl.h
+++ b/content/browser/web_contents/web_contents_impl.h
@@ -172,6 +172,7 @@ class CONTENT_EXPORT WebContentsImpl
   virtual content::BrowserContext* GetBrowserContext() const OVERRIDE;
   virtual content::RenderProcessHost* GetRenderProcessHost() const OVERRIDE;
   virtual content::RenderViewHost* GetRenderViewHost() const OVERRIDE;
+  virtual int GetRoutingID() const OVERRIDE;
   virtual content::RenderWidgetHostView*
       GetRenderWidgetHostView() const OVERRIDE;
   virtual content::WebContentsView* GetView() const OVERRIDE;
@@ -264,6 +265,9 @@ class CONTENT_EXPORT WebContentsImpl
   virtual content::WebContents* OpenURL(
       const content::OpenURLParams& params) OVERRIDE;
 
+  // Implementation of IPC::Sender.
+  virtual bool Send(IPC::Message* message) OVERRIDE;
+
   // RenderViewHostDelegate ----------------------------------------------------
 
   virtual content::RenderViewHostDelegateView* GetDelegateView() OVERRIDE;