[Sync] SyncEngine refactor part 1: interfaces.

components/sync/driver/generic_change_processor_unittest.cc

Index: components/sync/driver/generic_change_processor_unittest.cc
diff --git a/components/sync/driver/generic_change_processor_unittest.cc b/components/sync/driver/generic_change_processor_unittest.cc
index 96ddee15acfa8093f728cfec50a602ffecfe21ab..dc3d1bd6435669666d9188bfc943394782912106 100644
--- a/components/sync/driver/generic_change_processor_unittest.cc
+++ b/components/sync/driver/generic_change_processor_unittest.cc
@@ -73,15 +73,14 @@ class MockSyncApiComponentFactory : public SyncApiComponentFactory {
       const WeakHandle<DataTypeDebugInfoListener>& debug_info_listener,
       const DataTypeController::TypeMap* controllers,
       const DataTypeEncryptionHandler* encryption_handler,
-      SyncBackendHost* backend,
+      SyncEngine* backend,
       DataTypeManagerObserver* observer) override {
     return nullptr;
   };
-  SyncBackendHost* CreateSyncBackendHost(
-      const std::string& name,
-      invalidation::InvalidationService* invalidator,
-      const base::WeakPtr<SyncPrefs>& sync_prefs,
-      const base::FilePath& sync_folder) override {
+  SyncEngine* CreateSyncEngine(const std::string& name,
+                               invalidation::InvalidationService* invalidator,
+                               const base::WeakPtr<SyncPrefs>& sync_prefs,
+                               const base::FilePath& sync_folder) override {
     return nullptr;
   }
   std::unique_ptr<LocalDeviceInfoProvider> CreateLocalDeviceInfoProvider()