Fix remaining warnings for -Wmissing-braces and enable on win clang.

cloud_print/service/win/service.gyp

 # 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.
 {
   'target_defaults': {
     'variables': {
       'chromium_code': 1,
       'enable_wexit_time_destructors': 1,
     },
     'include_dirs': [
@@ skipping 70 matching lines @@
         'conditions': [
           ['clang==1', {
             # TODO: Remove once cloud_print_service_config.cc no longer depends
             # on atlapp.h, http://crbug.com/5027
             'VCCLCompilerTool': {
               'AdditionalOptions': [
                 # atlapp.h contains a global "using namespace WTL;".
                 '-Wno-header-hygiene',
                 # atlgdi.h does an intentional assignment in an if conditional.
                 '-Wno-parentheses',
+                # atlgdi.h fails with -Wreorder enabled.
+                '-Wno-reorder',
+                # atlgdi.h doesn't use braces around subobject initializers.
+                '-Wno-missing-braces',
               ],
             },
           }],
         ],
       },
-      'variables': {
-        'clang_warning_flags': [
-          # atlgdi.h fails with -Wreorder enabled.
-          '-Wno-reorder',
-        ]
-      },
     },
     {
       'target_name': 'cloud_print_service_setup',
       'type': 'executable',
       'sources': [
         '<(SHARED_INTERMEDIATE_DIR)/cloud_print/cloud_print_service_setup_exe_version.rc',
         'installer.cc',
         'installer.h',
       ],
       'includes': [
         'service_resources.gypi'
       ],
       'dependencies': [
         '<(DEPTH)/cloud_print/cloud_print_resources.gyp:cloud_print_version_resources',
         '<(DEPTH)/cloud_print/common/common.gyp:cloud_print_install_lib',
         '<(DEPTH)/cloud_print/service/service.gyp:cloud_print_service_lib',
       ],
       'msvs_settings': {
         'VCLinkerTool': {
           'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
           'UACExecutionLevel': '2', # /level='requireAdministrator'
           'AdditionalDependencies': [
               'secur32.lib',
           ],
         },
       },
     },
   ],
 }