Remove calls to MessageLoop::current() in chrome.

chrome/service/cloud_print/cloud_print_proxy_backend.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_
 
 #include <list>
 #include <string>
 
 #include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "chrome/service/cloud_print/connector_settings.h"
 #include "printing/backend/print_backend.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace gaia {
 struct OAuthClientInfo;
@@ skipping 62 matching lines @@
   // The real guts of SyncBackendHost, to keep the public client API clean.
   class Core;
 
   // A thread dedicated for use to perform initialization and authentication.
   base::Thread core_thread_;
 
   // The core, which communicates with AuthWatcher for GAIA authentication and
   // which contains printer registration code.
   scoped_refptr<Core> core_;
 
-  // A reference to the MessageLoop used to construct |this|, so we know how
-  // to safely talk back to the SyncFrontend.
-  base::MessageLoop* const frontend_loop_;
+  // A reference to the TaskRunner used to construct |this|, so we know how to
+  // safely talk back to the SyncFrontend.
+  const scoped_refptr<base::SingleThreadTaskRunner> frontend_task_runner_;
 
   // The frontend which is responsible for displaying UI and updating Prefs.
   // Outlives this backend.
   CloudPrintProxyFrontend* const frontend_;
 
   friend class base::RefCountedThreadSafe<CloudPrintProxyBackend::Core>;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintProxyBackend);
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_PROXY_BACKEND_H_