Move the thread hop for UMA user actions from content:: to base::.

chrome/browser/metrics/chrome_metrics_service_client.cc

 // Copyright 2014 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/metrics/chrome_metrics_service_client.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 327 matching lines @@
 
 bool ChromeMetricsServiceClient::IsReportingPolicyManaged() {
   return IsMetricsReportingPolicyManaged();
 }
 
 metrics::MetricsServiceClient::EnableMetricsDefault
 ChromeMetricsServiceClient::GetDefaultOptIn() {
   return GetMetricsReportingDefaultOptIn(g_browser_process->local_state());
 }
 
+scoped_refptr<base::SingleThreadTaskRunner>
+ChromeMetricsServiceClient::GetMainThreadTaskRunner() {
+  return content::BrowserThread::GetMessageLoopProxyForThread(
+      content::BrowserThread::UI);
+}
+
 void ChromeMetricsServiceClient::Initialize() {
   // Clear metrics reports if it is the first time cellular upload logic should
   // apply to avoid sudden bulk uploads. It needs to be done before initializing
   // metrics service so that metrics log manager is initialized correctly.
   if (ShouldClearSavedMetrics()) {
     PrefService* local_state = g_browser_process->local_state();
     local_state->ClearPref(metrics::prefs::kMetricsInitialLogs);
     local_state->ClearPref(metrics::prefs::kMetricsOngoingLogs);
   }
 
@@ skipping 328 matching lines @@
   }
 }
 
 void ChromeMetricsServiceClient::OnURLOpenedFromOmnibox(OmniboxLog* log) {
   metrics_service_->OnApplicationNotIdle();
 }
 
 bool ChromeMetricsServiceClient::IsUMACellularUploadLogicEnabled() {
   return IsCellularLogicEnabled();
 }