Cleanup: Remove unneeded forward declarations in chrome/browser/sync.

chrome/browser/sync/engine/syncer_proto_util.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_SYNC_ENGINE_SYNCER_PROTO_UTIL_H_
 #define CHROME_BROWSER_SYNC_ENGINE_SYNCER_PROTO_UTIL_H_
 #pragma once
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
 #include "chrome/browser/sync/syncable/blob.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 namespace syncable {
 class Directory;
 class Entry;
-class ScopedDirLookup;
-class SyncName;
 }  // namespace syncable
 
 namespace sync_pb {
 class ClientToServerResponse;
 class EntitySpecifics;
 }  // namespace sync_pb
 
 namespace browser_sync {
 
 namespace sessions {
 class SyncSession;
 }
 
-class AuthWatcher;
 class ClientToServerMessage;
 class ServerConnectionManager;
 class SyncEntity;
 class CommitResponse_EntryResponse;
 
 class SyncerProtoUtil {
  public:
   // Posts the given message and fills the buffer with the returned value.
   // Returns true on success.  Also handles store birthday verification:
   // session->status()->syncer_stuck_ is set true if the birthday is
@@ skipping 78 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, AddRequestBirthday);
   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, PostAndProcessHeaders);
   FRIEND_TEST_ALL_PREFIXES(SyncerProtoUtilTest, VerifyResponseBirthday);
 
   DISALLOW_COPY_AND_ASSIGN(SyncerProtoUtil);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_PROTO_UTIL_H_