Remove MessageLoop::current() from chrome_metrics_service_client.cc

content/public/browser/histogram_fetcher.h

Index: content/public/browser/histogram_fetcher.h
diff --git a/content/public/browser/histogram_fetcher.h b/content/public/browser/histogram_fetcher.h
index 3b0334403048ed22c757af967064d25e8ba4557d..e7625ce540502aaafdc6ee19bed9aafbba894af1 100644
--- a/content/public/browser/histogram_fetcher.h
+++ b/content/public/browser/histogram_fetcher.h
@@ -6,13 +6,10 @@
 #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
@@ -20,10 +17,10 @@ namespace content {
 // 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);