Don't process messages sent to dead routing ids.

content/test/web_contents_observer_sanity_checker.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/test/web_contents_observer_sanity_checker.h"
 
 #include "base/strings/stringprintf.h"
 #include "build/build_config.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/common/frame_messages.h"
@@ skipping 299 matching lines @@
                                           active_media_players_.end(), id),
                               active_media_players_.end());
 }
 
 bool WebContentsObserverSanityChecker::OnMessageReceived(
     const IPC::Message& message,
     RenderFrameHost* render_frame_host) {
   // FrameHostMsg_RenderProcessGone is special internal IPC message that
   // should not be leaking outside of RenderFrameHost.
   CHECK(message.type() != FrameHostMsg_RenderProcessGone::ID);
+  CHECK(render_frame_host->IsRenderFrameLive());
 
-#if !defined(OS_MACOSX)
-// TODO(avi): Disabled because of http://crbug.com/445054
   AssertRenderFrameExists(render_frame_host);
-#endif
   return false;
 }
 
 void WebContentsObserverSanityChecker::WebContentsDestroyed() {
   CHECK(!web_contents_destroyed_);
   web_contents_destroyed_ = true;
   CHECK(ongoing_navigations_.empty());
   CHECK(active_media_players_.empty());
 }
 
@@ skipping 65 matching lines @@
       if (live_routes_.count(entry.first))
         return true;
       if (current_hosts_.count(entry.first))
         return true;
     }
   }
   return false;
 }
 
 }  // namespace content