[Android WebView] Migrate the rendering code to a separate set of classes.

android_webview/browser/renderer_host/aw_render_view_host_ext.h

Index: android_webview/browser/renderer_host/aw_render_view_host_ext.h
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.h b/android_webview/browser/renderer_host/aw_render_view_host_ext.h
index 83bd439411ab2dbe2760ee7c3f76ea3f7a91d261..97c5e371d0a1dc573db4560932399fa6b7503282 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.h
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.h
@@ -18,17 +18,9 @@ namespace android_webview {
 class AwRenderViewHostExt : public content::WebContentsObserver,
                             public base::NonThreadSafe {
  public:
-  class Client {
-   public:
-    virtual void OnPictureUpdated(int process_id, int render_view_id) = 0;
-
-   protected:
-    virtual ~Client() {}
-  };
-
   // To send receive messages to a RenderView we take the WebContents instance,
   // as it internally handles RenderViewHost instances changing underneath us.
-  AwRenderViewHostExt(content::WebContents* contents, Client* client);
+  AwRenderViewHostExt(content::WebContents* contents);
   virtual ~AwRenderViewHostExt();
 
   // |result| will be invoked with the outcome of the request.
@@ -68,8 +60,6 @@ class AwRenderViewHostExt : public content::WebContentsObserver,
 
   bool has_new_hit_test_data_;
 
-  Client* client_;
-
   DISALLOW_COPY_AND_ASSIGN(AwRenderViewHostExt);
 };