Add a nullable string16 class to base. It combines a string16 + a null param...

chrome/browser/in_process_webkit/dom_storage_dispatcher_host.h

 // Copyright (c) 2009 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 CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_DISPATCHER_HOST_H_
 #define CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_DISPATCHER_HOST_H_
 
 #include "base/hash_tables.h"
+#include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
-#include "base/ref_counted.h"
 #include "ipc/ipc_message.h"
 
 class WebKitContext;
 class WebKitThread;
 
 namespace WebKit {
 class WebStorageArea;
 class WebStorageNamespace;
 class WebString;
 }
@@ skipping 83 matching lines @@
 
   // This is set once the Shutdown routine runs on the WebKit thread.  Once
   // set, we should not process any more messages because storage_area_map_
   // and storage_namespace_map_ contain pointers to deleted objects.
   bool shutdown_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(DOMStorageDispatcherHost);
 };
 
 #endif  // CHROME_BROWSER_IN_PROCESS_WEBKIT_DOM_STORAGE_DISPATCHER_HOST_H_