[Sync] Fix namespaces for the browser_sync component.

chrome/browser/sync/profile_sync_service_factory.h

Index: chrome/browser/sync/profile_sync_service_factory.h
diff --git a/chrome/browser/sync/profile_sync_service_factory.h b/chrome/browser/sync/profile_sync_service_factory.h
index 4c8c6c9e30238dbd69f69c3611a8b733a18e11f2..1ae0f4988afa5510a0d7aefa384d191c3d87cf54 100644
--- a/chrome/browser/sync/profile_sync_service_factory.h
+++ b/chrome/browser/sync/profile_sync_service_factory.h
@@ -13,20 +13,23 @@ template <typename T>
 struct DefaultSingletonTraits;
 }
 
+namespace browser_sync {
+class ProfileSyncService;
+}  // namespace browser_sync
+
 namespace sync_driver {
 class SyncClient;
 class SyncService;
 }
 
 class Profile;
-class ProfileSyncService;
 
 class ProfileSyncServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
   typedef base::Callback<std::unique_ptr<sync_driver::SyncClient>(Profile*)>
       SyncClientFactory;
 
-  static ProfileSyncService* GetForProfile(Profile* profile);
+  static browser_sync::ProfileSyncService* GetForProfile(Profile* profile);
   static bool HasProfileSyncService(Profile* profile);
 
   // Convenience method that returns the ProfileSyncService as a