[Sync] SyncEngine 1.5: Fix all backend references in PSS.

components/sync/engine/fake_sync_engine.cc

Index: components/sync/engine/fake_sync_engine.cc
diff --git a/components/sync/engine/fake_sync_engine.cc b/components/sync/engine/fake_sync_engine.cc
index a6ab2bbff1a15a31b6c0f8ba698b7282f3e6388d..969ea8910873db79d1591f0c4af115c33ecd6be8 100644
--- a/components/sync/engine/fake_sync_engine.cc
+++ b/components/sync/engine/fake_sync_engine.cc
@@ -29,9 +29,9 @@ void FakeSyncEngine::Initialize(
     const base::Closure& report_unrecoverable_error_function,
     const HttpPostProviderFactoryGetter& http_post_provider_factory_getter,
     std::unique_ptr<SyncEncryptionHandler::NigoriState> saved_nigori_state) {
-  host->OnBackendInitialized(WeakHandle<JsBackend>(),
-                             WeakHandle<DataTypeDebugInfoListener>(),
-                             kTestCacheGuid, !fail_initial_download_);
+  host->OnEngineInitialized(WeakHandle<JsBackend>(),
+                            WeakHandle<DataTypeDebugInfoListener>(),
+                            kTestCacheGuid, !fail_initial_download_);
 }
 
 void FakeSyncEngine::TriggerRefresh(const ModelTypeSet& types) {}