Remove MessageLoop::current() from chrome_metrics_service_client.cc

content/public/browser/histogram_fetcher.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 CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
 #define CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_
 
 #include "base/callback.h"
+#include "base/task_runner.h"
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 
-namespace base {
-class MessageLoop;
-}
-
 namespace content {
 
 // Fetch histogram data asynchronously from the various child processes, into
 // the browser process. This method is used by the metrics services in
 // preparation for a log upload. It contacts all processes, and get them to
 // upload to the browser any/all changes to histograms.  When all changes have
 // been acquired, or when the wait time expires (whichever is sooner), post the
-// callback to the specified message loop. Note the callback is posted exactly
+// callback to the specified TaskRunner. Note the callback is posted exactly
 // once.
 CONTENT_EXPORT void FetchHistogramsAsynchronously(
-    base::MessageLoop* callback_thread,
+    scoped_refptr<base::TaskRunner> task_runner,
     const base::Closure& callback,
     base::TimeDelta wait_time);
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_HISTOGRAM_FETCHER_H_