mac: Bump the deployment target of gcapi to 10.5.

chrome/chrome_installer.gypi

 # 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.
 
 {
   'variables': {
     'lastchange_path': '../build/util/LASTCHANGE',
     'libpeer_target_type%': 'static_library',
     'branding_dir': 'app/theme/<(branding_path_component)',
     'branding_dir_100': 'app/theme/default_100_percent/<(branding_path_component)',
@@ skipping 1029 matching lines @@
             'installer/gcapi_mac/gcapi.h',
             'installer/gcapi_mac/gcapi.mm',
           ],
           'link_settings': {
             'libraries': [
               '$(SDKROOT)/System/Library/Frameworks/Cocoa.framework',
             ],
           },
           'xcode_settings': {
             'ARCHS': [ 'i386', 'x86_64' ],
-            'MACOSX_DEPLOYMENT_TARGET': '10.4',
+            'MACOSX_DEPLOYMENT_TARGET': '10.5',
             'GCC_ENABLE_OBJC_GC': 'supported',
           },
         },
         {
           'target_name': 'gcapi_example',
           'type': 'executable',
           'dependencies': [
             'gcapi_lib',
           ],
           'include_dirs': [
             '..',
           ],
           'sources': [
             'installer/gcapi_mac/gcapi_example_client.mm',
           ],
         },
       ],  # targets
     }],  # OS=="mac"
   ],
 }