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

chrome/browser/ui/cocoa/extensions/extension_install_view_controller.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_UI_COCOA_EXTENSIONS_EXTENSION_INSTALL_VIEW_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_INSTALL_VIEW_CONTROLLER_H_
 
 #include <vector>
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace content {
 class PageNavigator;
 }
 
 // Displays the extension or bundle install prompt, and notifies the
 // ExtensionInstallPrompt::Delegate of success or failure
 @interface ExtensionInstallViewController : NSViewController
@@ skipping 40 matching lines @@
 - (id)initWithNavigator:(content::PageNavigator*)navigator
                delegate:(ExtensionInstallPrompt::Delegate*)delegate
                  prompt:(const ExtensionInstallPrompt::Prompt&)prompt;
 - (IBAction)storeLinkClicked:(id)sender; // Callback for "View details" link.
 - (IBAction)cancel:(id)sender;
 - (IBAction)ok:(id)sender;
 
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_EXTENSIONS_EXTENSION_INSTALL_VIEW_CONTROLLER_H_