Move //chrome/tools/mac_helpers:infoplist_strings_util to //chrome/tools/build/mac.

chrome/tools/build/mac/infoplist_strings_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.
 
 // Helper tool that is built and run during a build to pull strings from
 // the GRD files and generate the InfoPlist.strings files needed for
 // Mac OS X app bundles.
 
 #import <Foundation/Foundation.h>
 #include <stdint.h>
@@ skipping 315 matching lines @@
         [output_path stringByAppendingPathComponent:@"InfoPlist.strings"];
     if (![strings_file_contents_utf8 writeToFile:output_path
                                       atomically:YES]) {
       fprintf(stderr, "ERROR: Failed to write out '%s'\n",
               [output_path UTF8String]);
       exit(1);
     }
   }
   return 0;
 }