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

chrome/worker/nativewebworker_impl.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/nativewebworker_impl.h"
 
 #include "base/compiler_specific.h"
 
 #undef LOG
 
@@ skipping 146 matching lines @@
     const WebKit::WebMessagePortChannelArray& channel) {
   size_t len;
   char* bufp = WebStringToCharp(message, &len);
   // Send a message to NaCl object
   retval = NaClPostMessageToNativeWebWorker(bufp, len, &nap_, &channel_);
   delete[] bufp;
 }
 
 void NativeWebWorkerImpl::workerObjectDestroyed() {
 }
+
+void NativeWebWorkerImpl::clientDestroyed() {
+}