plugins: use OnChannelError to detect when the channel goes away

chrome/browser/utility_process_host.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/browser/utility_process_host.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
+#include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/process_util.h"
 #include "base/task.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 
 #if defined(OS_WIN)
 #include "chrome/browser/sandbox_policy.h"
 #elif defined(OS_POSIX)
 #include "base/global_descriptors_posix.h"
@@ skipping 115 matching lines @@
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackExtension_Succeeded,
                         Client::OnUnpackExtensionSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackExtension_Failed,
                         Client::OnUnpackExtensionFailed)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackWebResource_Succeeded,
                         Client::OnUnpackWebResourceSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_UnpackWebResource_Failed,
                         Client::OnUnpackWebResourceFailed)
   IPC_END_MESSAGE_MAP_EX()
 }