Avoid creating a RenderWidgetHostView for proxies.

content/browser/frame_host/render_frame_host_impl.h

Index: content/browser/frame_host/render_frame_host_impl.h
diff --git a/content/browser/frame_host/render_frame_host_impl.h b/content/browser/frame_host/render_frame_host_impl.h
index ae4b948cf9878ff9cb45c84671ee172f5d3d2ac5..8c5f9e153adb20aaf1ece3b90ec8cfd619b99eb3 100644
--- a/content/browser/frame_host/render_frame_host_impl.h
+++ b/content/browser/frame_host/render_frame_host_impl.h
@@ -80,15 +80,12 @@ struct ResourceResponse;
 enum CreateRenderFrameFlags {
   // The RFH will be initially placed on the swapped out hosts list.
   CREATE_RF_SWAPPED_OUT = 1 << 0,
-  // The new RenderFrame is being created for a navigation of the
-  // top-level frame.
-  CREATE_RF_FOR_MAIN_FRAME_NAVIGATION = 1 << 1,
   // The RenderFrame is initially hidden.
-  CREATE_RF_HIDDEN = 1 << 2,
+  CREATE_RF_HIDDEN = 1 << 1,
   // The RenderFrameHost will have a new RenderWidgetHost created and
   // attached to it. This is used when the RenderFrameHost is in a different
   // process from its parent frame.
-  CREATE_RF_NEEDS_RENDER_WIDGET_HOST = 1 << 3
+  CREATE_RF_NEEDS_RENDER_WIDGET_HOST = 1 << 2
 };
 
 class CONTENT_EXPORT RenderFrameHostImpl