Use a direct include of strings headers in base/.

base/metrics/stats_table.cc

 // 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.
 
 #include "base/metrics/stats_table.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/process_util.h"
 #include "base/shared_memory.h"
-#include "base/string_util.h"
 #include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread_local_storage.h"
 
 #if defined(OS_POSIX)
 #include "errno.h"
 #endif
 
 namespace base {
 
@@ skipping 536 matching lines @@
     static_cast<TLSData*>(tls_index_.Get());
   if (!data)
     return NULL;
 
   DCHECK(data->slot);
   DCHECK_EQ(data->table, this);
   return data;
 }
 
 }  // namespace base