Eliminate NOTIFICATION_HISTORY_LOADED notification

chrome/browser/sync/glue/bookmark_data_type_controller.h

Index: chrome/browser/sync/glue/bookmark_data_type_controller.h
diff --git a/chrome/browser/sync/glue/bookmark_data_type_controller.h b/chrome/browser/sync/glue/bookmark_data_type_controller.h
index c16c409410f0286f9569548442f65e5739fe9bfb..7fd4da6001f0d0e4d8f25f3940c6fa4436fa2fc4 100644
--- a/chrome/browser/sync/glue/bookmark_data_type_controller.h
+++ b/chrome/browser/sync/glue/bookmark_data_type_controller.h
@@ -8,17 +8,17 @@
 #include <string>
 
 #include "base/compiler_specific.h"
+#include "base/scoped_observer.h"
 #include "chrome/browser/sync/glue/frontend_data_type_controller.h"
 #include "components/bookmarks/browser/base_bookmark_model_observer.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
+#include "components/history/core/browser/history_service_observer.h"
 
 namespace browser_sync {
 
 // A class that manages the startup and shutdown of bookmark sync.
 class BookmarkDataTypeController : public FrontendDataTypeController,
-                                   public content::NotificationObserver,
-                                   public BaseBookmarkModelObserver {
+                                   public BaseBookmarkModelObserver,
+                                   public history::HistoryServiceObserver {
  public:
   BookmarkDataTypeController(ProfileSyncComponentsFactory* profile_sync_factory,
                              Profile* profile,
@@ -27,10 +27,8 @@ class BookmarkDataTypeController : public FrontendDataTypeController,
   // FrontendDataTypeController interface.
   syncer::ModelType type() const override;
 
-  // content::NotificationObserver interface.
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
+  // history::HistoryServiceObserver:
+  void OnHistoryServiceLoaded(HistoryService* service) override;
 
  private:
   ~BookmarkDataTypeController() override;
@@ -49,8 +47,6 @@ class BookmarkDataTypeController : public FrontendDataTypeController,
   // service have finished loading.
   bool DependentsLoaded();
 
-  content::NotificationRegistrar registrar_;
-
   BookmarkModel* bookmark_model_;
 
   // Have we installed ourselves as a BookmarkModel observer?