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

webkit/common/database/database_connections.h

 // 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.
 
 #ifndef WEBKIT_COMMON_DATABASE_DATABASE_CONNECTIONS_H_
 #define WEBKIT_COMMON_DATABASE_DATABASE_CONNECTIONS_H_
 
 #include <map>
 #include <vector>
 
 #include "base/memory/ref_counted.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/synchronization/lock.h"
 #include "webkit/storage/webkit_storage_export.h"
 
 namespace base {
 class MessageLoopProxy;
 }
 
 namespace webkit_database {
 
 class WEBKIT_STORAGE_EXPORT DatabaseConnections {
@@ skipping 66 matching lines @@
 
   bool waiting_for_dbs_to_close_;
   base::Lock open_connections_lock_;
   DatabaseConnections open_connections_;
   scoped_refptr<base::MessageLoopProxy> main_thread_;
 };
 
 }  // namespace webkit_database
 
 #endif  // WEBKIT_COMMON_DATABASE_DATABASE_CONNECTIONS_H_