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

content/browser/indexed_db/indexed_db_factory.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_
 #define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_
 
 #include <map>
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "content/browser/indexed_db/indexed_db_callbacks_wrapper.h"
 #include "content/browser/indexed_db/indexed_db_database_callbacks_wrapper.h"
 #include "content/browser/indexed_db/indexed_db_factory.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class IndexedDBBackingStore;
 class IndexedDBDatabase;
 
@@ skipping 41 matching lines @@
   typedef std::map<string16, base::WeakPtr<IndexedDBBackingStore> >
       IndexedDBBackingStoreMap;
   IndexedDBBackingStoreMap backing_store_map_;
 
   std::set<scoped_refptr<IndexedDBBackingStore> > session_only_backing_stores_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_FACTORY_H_