Refactor UKM interface for mojo-ification

chrome/browser/plugins/plugin_info_message_filter.h

 // 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.
 
 #ifndef CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "base/strings/string_piece.h"
 #include "chrome/browser/plugins/plugin_metadata.h"
 #include "chrome/browser/plugins/plugin_prefs.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/keyed_service/core/keyed_service_shutdown_notifier.h"
 #include "components/prefs/pref_member.h"
+#include "components/ukm/ukm_service.h"
 #include "content/public/browser/browser_message_filter.h"
 #include "extensions/features/features.h"
 #include "ppapi/features/features.h"
 
 struct ChromeViewHostMsg_GetPluginInfo_Output;
 enum class ChromeViewHostMsg_GetPluginInfo_Status;
 class GURL;
 class HostContentSettingsMap;
 class Profile;
 
@@ skipping 119 matching lines @@
       std::vector<base::string16>* additional_param_names,
       std::vector<base::string16>* additional_param_values);
 #endif
 
   // Reports usage metrics to RAPPOR and UKM. This must be a class function,
   // because UkmService requires a friend declaration by design to call.
   void ReportMetrics(int render_frame_id,
                      const base::StringPiece& mime_type,
                      const GURL& url,
                      const url::Origin& main_frame_origin,
-                     int32_t ukm_source_id);
+                     ukm::SourceId ukm_source_id);
 
   Context context_;
   std::unique_ptr<KeyedServiceShutdownNotifier::Subscription>
       shutdown_notifier_;
 
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
-  const int32_t ukm_source_id_;
+  const ukm::SourceId ukm_source_id_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginInfoMessageFilter);
 };
 
 #endif  // CHROME_BROWSER_PLUGINS_PLUGIN_INFO_MESSAGE_FILTER_H_