[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/syncable/entry.h

 // 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.
 
 #ifndef SYNC_SYNCABLE_ENTRY_H_
 #define SYNC_SYNCABLE_ENTRY_H_
 
 #include "sync/syncable/entry_kernel.h"
 
 namespace syncer {
@@ skipping 121 matching lines @@
       : basetrans_(trans),
         kernel_(NULL) { }
 
  protected:
   BaseTransaction* const basetrans_;
 
   EntryKernel* kernel_;
 
  private:
   friend class Directory;
-  friend class syncer::ReadNode;
+  friend class ReadNode;
   friend std::ostream& operator << (std::ostream& s, const Entry& e);
 
   DISALLOW_COPY_AND_ASSIGN(Entry);
 };
 
 std::ostream& operator<<(std::ostream& os, const Entry& entry);
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // SYNC_SYNCABLE_ENTRY_H_