Allow changing metrics reporting state without callback.

chrome/browser/metrics/metrics_reporting_state.h

Index: chrome/browser/metrics/metrics_reporting_state.h
diff --git a/chrome/browser/metrics/metrics_reporting_state.h b/chrome/browser/metrics/metrics_reporting_state.h
index 303255ced27232e485725ba102f54443e5918b1c..89c1dc705d035fd66cb8db4b7428ee071565b62c 100644
--- a/chrome/browser/metrics/metrics_reporting_state.h
+++ b/chrome/browser/metrics/metrics_reporting_state.h
@@ -13,13 +13,16 @@ typedef base::Callback<void(bool)> OnMetricsReportingCallbackType;
 class PrefService;
 class PrefRegistrySimple;
 
-// Initiates a change to metrics reporting state to the new value of |enabled|.
-// Starts or stops the metrics service based on the new state and then runs
-// |callback_fn| (which can be null) with the updated state (as the operation
-// may fail). On platforms other than CrOS and Android, also updates the
-// underlying pref.
+// Changes metrics reporting state without caring about the success of the
+// change.
+void ChangeMetricsReportingState(bool enabled);
+
+// Changes metrics reporting state to the new value of |enabled|. Starts or
+// stops the metrics service based on the new state and then runs |callback_fn|
+// (which can be null) with the updated state (as the operation may fail). On
+// platforms other than CrOS and Android, also updates the underlying pref.
 // TODO(gayane): Support setting the pref on all platforms.
-void InitiateMetricsReportingChange(
+void ChangeMetricsReportingStateWithReply(
     bool enabled,
     const OnMetricsReportingCallbackType& callback_fn);