[Sync] Refactor sync manager into interface.

sync/internal_api/js_sync_manager_observer_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/internal_api/js_sync_manager_observer.h"
 
 #include "base/basictypes.h"
 #include "base/location.h"
 #include "base/message_loop.h"
 #include "base/values.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
+#include "sync/internal_api/public/util/sync_string_conversions.h"
 #include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/js/js_event_details.h"
 #include "sync/js/js_test_util.h"
 #include "sync/protocol/sync_protocol_error.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 namespace {
 
 using ::testing::InSequence;
@@ skipping 177 matching lines @@
               HandleJsEvent("onEncryptedTypesChanged",
                             HasDetailsAsDictionary(expected_details)));
 
   js_sync_manager_observer_.OnEncryptedTypesChanged(
       encrypted_types, encrypt_everything);
   PumpLoop();
 }
 
 }  // namespace
 }  // namespace syncer