Switch ContentSettingsObserver to be a RenderFrameObserver instead of a RenderViewObserver

content/browser/frame_host/render_frame_host_delegate.h

Index: content/browser/frame_host/render_frame_host_delegate.h
===================================================================
--- content/browser/frame_host/render_frame_host_delegate.h	(revision 240362)
+++ content/browser/frame_host/render_frame_host_delegate.h	(working copy)
@@ -13,6 +13,7 @@
 
 namespace content {
 class RenderFrameHost;
+class WebContents;
 
 // An interface implemented by an object interested in knowing about the state
 // of the RenderFrameHost.
@@ -28,6 +29,10 @@
   // Informs the delegate whenever a RenderFrameHost is deleted.
   virtual void RenderFrameDeleted(RenderFrameHost* render_frame_host) {}
 
+  // Return this object cast to a WebContents, if it is one. If the object is
+  // not a WebContents, returns NULL.
+  virtual WebContents* GetAsWebContents();
+
  protected:
   virtual ~RenderFrameHostDelegate() {}
 };