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

android_webview/browser/renderer_host/aw_render_view_host_ext.cc

Index: android_webview/browser/renderer_host/aw_render_view_host_ext.cc
diff --git a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
index 73bcad0c5482ac625d9af265876a9950c29aa6cd..b6882f61654743441d4f83ec379b07615bab2808 100644
--- a/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
+++ b/android_webview/browser/renderer_host/aw_render_view_host_ext.cc
@@ -14,11 +14,9 @@
 
 namespace android_webview {
 
-AwRenderViewHostExt::AwRenderViewHostExt(content::WebContents* contents,
-                                         Client* client)
+AwRenderViewHostExt::AwRenderViewHostExt(content::WebContents* contents)
     : content::WebContentsObserver(contents),
-      has_new_hit_test_data_(false),
-      client_(client) {
+      has_new_hit_test_data_(false) {
 }
 
 AwRenderViewHostExt::~AwRenderViewHostExt() {}
@@ -78,8 +76,6 @@ bool AwRenderViewHostExt::OnMessageReceived(const IPC::Message& message) {
                         OnDocumentHasImagesResponse)
     IPC_MESSAGE_HANDLER(AwViewHostMsg_UpdateHitTestData,
                         OnUpdateHitTestData)
-    IPC_MESSAGE_HANDLER(AwViewHostMsg_PictureUpdated,
-                        OnPictureUpdated)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -106,10 +102,4 @@ void AwRenderViewHostExt::OnUpdateHitTestData(
   has_new_hit_test_data_ = true;
 }
 
-void AwRenderViewHostExt::OnPictureUpdated() {
-  if (client_)
-    client_->OnPictureUpdated(web_contents()->GetRenderProcessHost()->GetID(),
-                              routing_id());
-}
-
 }  // namespace android_webview