Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/extensions/extension_special_storage_policy.cc

 // Copyright (c) 2012 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/extensions/extension_special_storage_policy.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/content_settings/cookie_settings_factory.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "chrome/common/url_constants.h"
 #include "components/content_settings/core/browser/cookie_settings.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 333 matching lines @@
 }
 
 void ExtensionSpecialStoragePolicy::SpecialCollection::Clear() {
   ClearCache();
   extensions_.Clear();
 }
 
 void ExtensionSpecialStoragePolicy::SpecialCollection::ClearCache() {
   base::STLDeleteValues(&cached_results_);
 }