Shutdown RenderWidgetHost owned by RenderFrameHost when destroying the RenderFrameHost.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 9a1f4b09c38beb9d1633cc2640b1f1b3186fcf4c..0923657632c9eabcf91d2ec323cdbfeb7373cac5 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1336,13 +1336,6 @@ void RenderWidgetHostImpl::SetAutoResize(bool enable,
   max_size_for_auto_resize_ = max_size;
 }
 
-void RenderWidgetHostImpl::Cleanup() {
-  if (view_) {
-    view_->Destroy();
-    view_ = nullptr;
-  }
-}
-
 void RenderWidgetHostImpl::Destroy() {
   NotificationService::current()->Notify(
       NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,