Enable sending frame-specific messages to the correct input router.

content/browser/frame_host/render_frame_host_impl.cc

Index: content/browser/frame_host/render_frame_host_impl.cc
diff --git a/content/browser/frame_host/render_frame_host_impl.cc b/content/browser/frame_host/render_frame_host_impl.cc
index 5a952970ac8865eb5574a36cc224b116fcdb409b..3a8aea74cf7cd498fc9317d583605e51f47f9f18 100644
--- a/content/browser/frame_host/render_frame_host_impl.cc
+++ b/content/browser/frame_host/render_frame_host_impl.cc
@@ -478,7 +478,7 @@ blink::WebPageVisibilityState RenderFrameHostImpl::GetVisibilityState() {
 
 bool RenderFrameHostImpl::Send(IPC::Message* message) {
   if (IPC_MESSAGE_ID_CLASS(message->type()) == InputMsgStart) {
-    return render_view_host_->GetWidget()->input_router()->SendInput(
+    return GetRenderWidgetHost()->input_router()->SendInput(
         base::WrapUnique(message));
   }