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

chrome/browser/ui/cocoa/external_protocol_dialog.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/external_protocol_dialog.h"
 
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 #include "ui/base/text/text_elider.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 // ExternalProtocolHandler
@@ skipping 127 matching lines @@
   }
   NSString* appPath = [(NSURL*)openingApp path];
   CFRelease(openingApp);  // NOT A BUG; LSGetApplicationForURL retains for us
   NSString* appDisplayName =
       [[NSFileManager defaultManager] displayNameAtPath:appPath];
 
   return base::SysNSStringToUTF16(appDisplayName);
 }
 
 @end