base/ header cleanup. Forward declaration instead of including.

base/data_pack.h

 // Copyright (c) 2008 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.
 
 // DataPack represents a read-only view onto an on-disk file that contains
 // (key, value) pairs of data.  It's used to store static resources like
 // translation strings and images.
 
 #ifndef BASE_DATA_PACK_H_
 #define BASE_DATA_PACK_H_
 #pragma once
 
 #include <map>
 
 #include "base/basictypes.h"
-#include "base/ref_counted_memory.h"
 #include "base/scoped_ptr.h"
 
 namespace file_util {
   class MemoryMappedFile;
 }
 class FilePath;
+class RefCountedStaticMemory;
 
 namespace base {
 
 class StringPiece;
 
 class DataPack {
  public:
   DataPack();
   ~DataPack();
 
@@ skipping 20 matching lines @@
 
   // Number of resources in the data.
   size_t resource_count_;
 
   DISALLOW_COPY_AND_ASSIGN(DataPack);
 };
 
 }  // namespace base
 
 #endif  // BASE_DATA_PACK_H_