Revert of Separate RenderView from RenderWidget, part 1: inheritance.

content/renderer/render_frame_proxy.cc

Index: content/renderer/render_frame_proxy.cc
diff --git a/content/renderer/render_frame_proxy.cc b/content/renderer/render_frame_proxy.cc
index 67b57f5e639505740a21bf8f2acfe8b8660a07ae..26dca26a92b467f670ba846e9a823b19ac3db3d8 100644
--- a/content/renderer/render_frame_proxy.cc
+++ b/content/renderer/render_frame_proxy.cc
@@ -101,7 +101,7 @@
     web_frame =
         blink::WebRemoteFrame::create(replicated_state.scope, proxy.get());
     render_view->webview()->setMainFrame(web_frame);
-    render_widget = render_view->GetWidget();
+    render_widget = render_view;
   } else {
     // Create a frame under an existing parent. The parent is always expected
     // to be a RenderFrameProxy, because navigations initiated by local frames