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

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index f001e7d2ae271fd4662145d8dae8999b644b0357..ee8b839497eff44ee170dfa30382af1c80471f49 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -2260,10 +2260,6 @@
   return RenderWidget::Send(message);
 }
 
-RenderWidget* RenderViewImpl::GetWidget() const {
-  return const_cast<RenderWidget*>(static_cast<const RenderWidget*>(this));
-}
-
 RenderFrameImpl* RenderViewImpl::GetMainRenderFrame() {
   return main_render_frame_;
 }