Migrate more files to histogram_macros.h from histogram.h.

chrome/common/extensions/extension_metrics.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/common/extensions/extension_metrics.h"
 
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension.h"
 
 namespace extensions {
 
 void RecordAppLaunchType(extension_misc::AppLaunchBucket bucket,
                          extensions::Manifest::Type app_type) {
   DCHECK_LT(bucket, extension_misc::APP_LAUNCH_BUCKET_BOUNDARY);
   if (app_type == extensions::Manifest::TYPE_PLATFORM_APP) {
     UMA_HISTOGRAM_ENUMERATION("Apps.AppLaunch", bucket,
@@ skipping 23 matching lines @@
     bucket = extension_misc::APP_LAUNCH_APP_LIST_MAIN_CHROME;
   RecordAppLaunchType(bucket, extension->GetType());
 }
 
 void RecordWebStoreLaunch() {
   RecordAppLaunchType(extension_misc::APP_LAUNCH_NTP_WEBSTORE,
                       extensions::Manifest::TYPE_HOSTED_APP);
 }
 
 }  // namespace extensions