Switch the inheritance of WebView from WebWidget to protected.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 0c01803884336fc3b8c0800c29ca32abea44d11a..257dfe7da13d01f071ca67a50eac1340b3d7b30e 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -902,6 +902,8 @@ class CONTENT_EXPORT RenderViewImpl
 
   // View ----------------------------------------------------------------------
 
+  blink::WebView* webview_;
+
   // Cache the preferred size of the page in order to prevent sending the IPC
   // when layout() recomputes but doesn't actually change sizes.
   gfx::Size preferred_size_;