Don't process messages sent to dead routing ids.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index b772300a5bbee56c36fca5b669c7bc1e39b704a0..9e851d04c51e0cb6ca25a264c0edfbcd835a83c0 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -898,6 +898,10 @@ bool RenderViewHostImpl::SuddenTerminationAllowed() const {
 // RenderViewHostImpl, IPC message handlers:
 
 bool RenderViewHostImpl::OnMessageReceived(const IPC::Message& msg) {
+  // Only process messages if the RenderView is alive.
+  if (!renderer_initialized())
+    return false;
+
   if (!BrowserMessageFilter::CheckCanDispatchOnUI(
           msg, static_cast<RenderWidgetHostImpl*>(this))) {
     return true;