Move platform_thread to base/threading and put in the base namespace. I left ...

net/disk_cache/block_files.h

 // Copyright (c) 2010 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.
 
 // See net/disk_cache/disk_cache.h for the public interface.
 
 #ifndef NET_DISK_CACHE_BLOCK_FILES_H__
 #define NET_DISK_CACHE_BLOCK_FILES_H__
 #pragma once
 
 #include <vector>
 
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/scoped_ptr.h"
 #include "net/disk_cache/addr.h"
 #include "net/disk_cache/mapped_file.h"
 
+namespace base {
 class ThreadChecker;
+}
 
 namespace disk_cache {
 
 // This class handles the set of block-files open by the disk cache.
 class BlockFiles {
  public:
   explicit BlockFiles(const FilePath& path);
   ~BlockFiles();
 
   // Performs the object initialization. create_files indicates if the backing
@@ skipping 50 matching lines @@
   // Retrieves stats for the given file index.
   void GetFileStats(int index, int* used_count, int* load);
 
   // Returns the filename for a given file index.
   FilePath Name(int index);
 
   bool init_;
   char* zero_buffer_;  // Buffer to speed-up cleaning deleted entries.
   FilePath path_;  // Path to the backing folder.
   std::vector<MappedFile*> block_files_;  // The actual files.
-  scoped_ptr<ThreadChecker> thread_checker_;
+  scoped_ptr<base::ThreadChecker> thread_checker_;
 
   FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_ZeroSizeFile);
   FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_InvalidFile);
   FRIEND_TEST_ALL_PREFIXES(DiskCacheTest, BlockFiles_Stats);
 
   DISALLOW_COPY_AND_ASSIGN(BlockFiles);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_BLOCK_FILES_H__