Use a direct include of strings headers in base/.

base/mac/authorization_util.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.
 
 #include "base/mac/authorization_util.h"
 
 #import <Foundation/Foundation.h>
 #include <sys/wait.h>
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_logging.h"
 #import "base/mac/mac_util.h"
 #include "base/mac/scoped_authorizationref.h"
 #include "base/posix/eintr_wrapper.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
 
 namespace base {
 namespace mac {
 
 AuthorizationRef AuthorizationCreateToRunAsRoot(CFStringRef prompt) {
   // Create an empty AuthorizationRef.
   ScopedAuthorizationRef authorization;
   OSStatus status = AuthorizationCreate(NULL,
                                         kAuthorizationEmptyEnvironment,
                                         kAuthorizationFlagDefaults,
@@ skipping 147 matching lines @@
     }
   } else {
     *exit_status_pointer = -1;
   }
 
   return status;
 }
 
 }  // namespace mac
 }  // namespace base