Refactor UKM interface for mojo-ification

chrome/browser/plugins/plugin_info_message_filter.h

Index: chrome/browser/plugins/plugin_info_message_filter.h
diff --git a/chrome/browser/plugins/plugin_info_message_filter.h b/chrome/browser/plugins/plugin_info_message_filter.h
index 56efa4c4ded91030e13a4c8ef750d9dfc9608de6..a0ce567ea1965fa7ca2f430be2fcde9a65c35646 100644
--- a/chrome/browser/plugins/plugin_info_message_filter.h
+++ b/chrome/browser/plugins/plugin_info_message_filter.h
@@ -19,6 +19,7 @@
 #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"
@@ -158,7 +159,7 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
                      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>
@@ -166,7 +167,7 @@ class PluginInfoMessageFilter : public content::BrowserMessageFilter {
 
   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);
 };