Fix another race condition on worker process shutdown that results in use-aft...

chrome/worker/webworkerclient_proxy.cc

 // Copyright (c) 2009 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 "chrome/worker/webworkerclient_proxy.h"
 
 #include "base/command_line.h"
 #include "chrome/common/child_process.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/webmessageportchannel_impl.h"
@@ skipping 58 matching lines @@
     impl_ = NativeWebWorkerImpl::create(this);
   } else {
     // Launch a JavaScript worker.
     impl_ = WebWorker::create(this);
   }
   WorkerThread::current()->AddRoute(route_id_, this);
   ChildProcess::current()->AddRefProcess();
 }
 
 WebWorkerClientProxy::~WebWorkerClientProxy() {
+  impl_->clientDestroyed();
   WorkerThread::current()->RemoveRoute(route_id_);
   ChildProcess::current()->ReleaseProcess();
 }
 
 void WebWorkerClientProxy::postMessageToWorkerObject(
     const WebString& message,
     const WebMessagePortChannelArray& channels) {
   std::vector<int> message_port_ids(channels.size());
   std::vector<int> routing_ids(channels.size());
   for (size_t i = 0; i < channels.size(); ++i) {
@@ skipping 98 matching lines @@
     const std::vector<int>& sent_message_port_ids,
     const std::vector<int>& new_routing_ids) {
   WebMessagePortChannelArray channels(sent_message_port_ids.size());
   for (size_t i = 0; i < sent_message_port_ids.size(); i++) {
     channels[i] = new WebMessagePortChannelImpl(
         new_routing_ids[i], sent_message_port_ids[i]);
   }
 
   impl_->postMessageToWorkerContext(message, channels);
 }