Set -fmsc-version for the Windows Clang build

build/common.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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 4692 matching lines @@
                   '-Wno-tautological-compare',
                   '-Wno-unknown-pragmas',
                   '-Wno-unsequenced',
                   '-Wno-unused-function',
                   '-Wno-unused-private-field',
                   '-Wno-unused-value',
                   '-Wno-unused-variable',
                   '-ferror-limit=1',
                 ],
               },
+              'conditions': [
+                ['MSVS_VERSION=="2013" or MSVS_VERSION=="2013e"', {
+                  'VCCLCompilerTool': {
+                    'AdditionalOptions': [
+                      '-fmsc-version=1800',
+                    ],
+                  },
+                }],
+                ['MSVS_VERSION=="2010" or MSVS_VERSION=="2010e"', {
+                  'VCCLCompilerTool': {
+                    'AdditionalOptions': [
+                      '-fmsc-version=1600',
+                    ],
+                  },
+                }],
+              ],
             }],
           ],
         },
       },
     }],
     ['disable_nacl==1', {
       'target_defaults': {
         'defines': [
           'DISABLE_NACL',
         ],
@@ skipping 171 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }