Use a direct include of strings headers in chrome/browser/chromeos/.

chrome/browser/chromeos/extensions/file_manager/file_manager_notifications.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_MANAGER_NOTIFICATIONS_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_MANAGER_NOTIFICATIONS_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/weak_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/time.h"
 
 class Profile;
 
 class FileManagerNotifications
     : public base::SupportsWeakPtr<FileManagerNotifications> {
  public:
   // If changing the enum, please also update kNotificationTypes in .cc file.
   enum NotificationType {
     DEVICE,
@@ skipping 66 matching lines @@
 
   NotificationMap notification_map_;
   std::set<std::string> hidden_notifications_;
   MountRequestsMap mount_requests_;
   Profile* profile_;
 
   DISALLOW_COPY_AND_ASSIGN(FileManagerNotifications);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_FILE_MANAGER_FILE_MANAGER_NOTIFICATIONS_H_