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

chrome/browser/sync/internal_api/read_node.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_INTERNAL_API_READ_NODE_H_
 #define CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "chrome/browser/sync/internal_api/base_node.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
-namespace sync_pb {
-class AppSpecifics;
-class AutofillSpecifics;
-class AutofillProfileSpecifics;
-class BookmarkSpecifics;
-class EntitySpecifics;
-class ExtensionSpecifics;
-class SessionSpecifics;
-class NigoriSpecifics;
-class PreferenceSpecifics;
-class PasswordSpecificsData;
-class ThemeSpecifics;
-class TypedUrlSpecifics;
-}
-
 namespace sync_api {
 
 // ReadNode wraps a syncable::Entry to provide the functionality of a
 // read-only BaseNode.
 class ReadNode : public BaseNode {
  public:
   // Create an unpopulated ReadNode on the given transaction.  Call some flavor
   // of Init to populate the ReadNode with a database entry.
   explicit ReadNode(const BaseTransaction* transaction);
   virtual ~ReadNode();
@@ skipping 30 matching lines @@
 
   // The sync API transaction that is the parent of this node.
   const BaseTransaction* transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadNode);
 };
 
 }  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_INTERNAL_API_READ_NODE_H_