Upstream "nsurl_util.{h,mm}" from Chrome on iOS repository.

url/url.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     'url_srcs.gypi',
@@ skipping 36 matching lines @@
         ['use_icu_alternatives_on_android==1 and OS=="android"', {
           'dependencies': [
             'url_java',
             'url_jni_headers',
           ],
           'sources': [
             'url_canon_icu_alternatives_android.cc',
             'url_canon_icu_alternatives_android.h',
           ],
         }],
+        ['OS=="mac" or OS=="ios"', {
+          'sources': [
+            'mac/url_conversions.h',
+            'mac/url_conversions.mm',
+          ],
+        }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
     {
       'target_name': 'url_unittests',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:run_all_unittests',
         '../testing/gtest.gyp:gtest',
@@ skipping 20 matching lines @@
         ['use_icu_alternatives_on_android==1',
           {
             'sources!': [
               'url_canon_icu_unittest.cc',
             ],
             'dependencies!': [
               '../third_party/icu/icu.gyp:icuuc',
             ],
           }
         ],
+        ['OS=="mac" or OS=="ios"', {
+          'sources': [
+            'mac/url_conversions_unittest.mm',
+          ],
+        }],
       ],
       # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
       'msvs_disabled_warnings': [4267, ],
     },
   ],
   'conditions': [
     ['use_icu_alternatives_on_android==1 and OS=="android"', {
       'targets': [
         {
           'target_name': 'url_jni_headers',
@@ skipping 14 matching lines @@
           },
           'dependencies': [
             '../base/base.gyp:base',
           ],
           'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }