Use stricter type checking in UMA_HISTOGRAM_ENUMERATION

chrome/browser/notifications/message_center_stats_collector.cc

 // Copyright 2013 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/notifications/message_center_stats_collector.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 22 matching lines @@
   actions_[type] = true;
 }
 
 void MessageCenterStatsCollector::NotificationStats::RecordAggregateStats() {
   DCHECK(!id_.empty());
 
   for (size_t i = 0; i < NOTIFICATION_ACTION_COUNT; i++) {
     if (!actions_[i])
       continue;
     UMA_HISTOGRAM_ENUMERATION("Notifications.PerNotificationActions",
-                              i,
+                              static_cast<NotificationActionType>(i),
                               NOTIFICATION_ACTION_COUNT);
   }
 }
 
 MessageCenterStatsCollector::MessageCenterStatsCollector(
     message_center::MessageCenter* message_center)
     : message_center_(message_center) {
   message_center_->AddObserver(this);
 }
 
@@ skipping 85 matching lines @@
   }
 }
 
 void MessageCenterStatsCollector::OnQuietModeChanged(bool in_quiet_mode) {
   if (in_quiet_mode) {
     base::RecordAction(base::UserMetricsAction("Notifications.Mute"));
   } else {
     base::RecordAction(base::UserMetricsAction("Notifications.Unmute"));
   }
 }