clang/win: Disable -Wwritable-strings for most cloud_print service targets.

cloud_print/service/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 51 matching lines @@
         'service_resources',
       ],
       'conditions': [
         ['OS=="win"', {
           'dependencies': [
             '<(DEPTH)/chrome/chrome.gyp:chrome_version_header',
             '<(DEPTH)/chrome/chrome.gyp:launcher_support',
             '<(DEPTH)/chrome/common_constants.gyp:common_constants',
           ],
         }],
+        ['OS=="win" and clang==1', {
+          # service_controller.h uses DECLARE_REGISTRY_APPID_RESOURCEID, which
+          # in msvs2013 returns string literals via a non-const pointer. So
+          # disable this warning for now.
+          # TODO(thakis): Remove this once we're on 2014,
+          # https://connect.microsoft.com/VisualStudio/feedback/details/806376/atl-hindrances-to-adopting-new-strictstrings-conformance-option-in-vs2013
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': ['-Wno-writable-strings'],
+            },
+          },
+          'direct_dependent_settings': {
+            'msvs_settings': {
+              'VCCLCompilerTool': {
+                'AdditionalOptions': ['-Wno-writable-strings'],
+              },
+            },
+          },
+        }],
         ['enable_printing!=0', {
           'dependencies': [
             '<(DEPTH)/printing/printing.gyp:printing',
           ],
         }],
       ],
       'sources': [
         '<(DEPTH)/content/public/common/content_switches.h',
         '<(DEPTH)/content/public/common/content_switches.cc',
         '<(DEPTH)/cloud_print/common/win/cloud_print_utils.cc',
@@ skipping 100 matching lines @@
           'SubSystem': '2',         # Set /SUBSYSTEM:WINDOWS
           'UACExecutionLevel': '2', # /level='requireAdministrator'
           'AdditionalDependencies': [
               'secur32.lib',
           ],
         },
       },
     },
   ],
 }