Get rid of MessageLoop* caching in extensions code.

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 "app/app_switches.h"
 #include "app/l10n_util.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/string_util.h"
 #include "base/task.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "ipc/ipc_switches.h"
 
 #if defined(OS_WIN)
 #include "chrome/browser/sandbox_policy.h"
 #elif defined(OS_POSIX)
 #include "base/global_descriptors_posix.h"
 #include "ipc/ipc_descriptors.h"
 #endif
 
 UtilityProcessHost::UtilityProcessHost(ResourceDispatcherHost* rdh,
                                        Client* client,
-                                       MessageLoop* client_loop)
+                                       ChromeThread::ID client_thread_id)
     : ChildProcessHost(UTILITY_PROCESS, rdh),
       client_(client),
-      client_loop_(client_loop) {
+      client_thread_id_(client_thread_id) {
 }
 
 UtilityProcessHost::~UtilityProcessHost() {
 }
 
 bool UtilityProcessHost::StartExtensionUnpacker(const FilePath& extension) {
   // Grant the subprocess access to the entire subdir the extension file is
   // in, so that it can unpack to that dir.
   if (!StartProcess(extension.DirName()))
     return false;
@@ skipping 89 matching lines @@
   base::LaunchApp(cmd_line.argv(), fds_to_map, false, &process);
 #endif
   if (!process)
     return false;
   SetHandle(process);
 
   return true;
 }
 
 void UtilityProcessHost::OnMessageReceived(const IPC::Message& message) {
-  client_loop_->PostTask(FROM_HERE,
+  ChromeThread::PostTask(
+      client_thread_id_, FROM_HERE,
       NewRunnableMethod(client_.get(), &Client::OnMessageReceived, message));
 }
 
 void UtilityProcessHost::OnChannelError() {
   bool child_exited;
   bool did_crash = base::DidProcessCrash(&child_exited, handle());
   if (did_crash) {
-    client_loop_->PostTask(FROM_HERE,
+    ChromeThread::PostTask(
+        client_thread_id_, FROM_HERE,
         NewRunnableMethod(client_.get(), &Client::OnProcessCrashed));
   }
 }
 
 void UtilityProcessHost::Client::OnMessageReceived(
     const IPC::Message& message) {
   IPC_BEGIN_MESSAGE_MAP(UtilityProcessHost, message)
     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_MESSAGE_HANDLER(UtilityHostMsg_ParseUpdateManifest_Succeeded,
                         Client::OnParseUpdateManifestSucceeded)
     IPC_MESSAGE_HANDLER(UtilityHostMsg_ParseUpdateManifest_Failed,
                         Client::OnParseUpdateManifestFailed)
   IPC_END_MESSAGE_MAP_EX()
 }