Re-land update Xcode emulation extra plist items for Xcode 7.2

test/ios/app-bundle/test-archs.gyp

 # Copyright (c) 2013 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'make_global_settings': [
     ['CC', '/usr/bin/clang'],
   ],
   'target_defaults': {
-    'product_extension': 'bundle',
     'mac_bundle_resources': [
       'TestApp/English.lproj/InfoPlist.strings',
       'TestApp/English.lproj/MainMenu.xib',
     ],
     'link_settings': {
       'libraries': [
         '$(SDKROOT)/System/Library/Frameworks/Foundation.framework',
         '$(SDKROOT)/System/Library/Frameworks/UIKit.framework',
       ],
     },
@@ skipping 81 matching lines @@
         'VALID_ARCHS': [
           'x86_64',
           'i386',
           'arm64',
           'armv7',
         ],
       }
     },
   ],
 }