Use a direct include of strings headers in content/browser/, part 1.

content/browser/download/save_file_manager.cc

 // 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.
 
 #include "build/build_config.h"
 
 #include "content/browser/download/save_file_manager.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/stl_util.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/threading/thread.h"
 #include "content/browser/download/save_file.h"
 #include "content/browser/download/save_package.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_util.h"
@@ skipping 501 matching lines @@
       SaveFile* save_file = it->second;
       DCHECK(!save_file->InProgress());
       file_util::Delete(save_file->FullPath(), false);
       delete save_file;
       save_file_map_.erase(it);
     }
   }
 }
 
 }  // namespace content