[build] Use MSVS 2015 by default.

tools/mb/mb.py

 #!/usr/bin/env python
 # Copyright 2016 the V8 project authors. All rights reserved.
 # Copyright 2015 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.
 
 """MB - the Meta-Build wrapper around GYP and GN
 
 MB is a wrapper script for GYP and GN that can be used to generate build files
 for sets of canned configurations and analyze them.
@@ skipping 22 matching lines @@
     os.path.abspath(__file__))))
 sys.path = [os.path.join(CHROMIUM_SRC_DIR, 'build')] + sys.path
 
 import gn_helpers
 
 
 # We override this here as some legacy gyp scripts are still called through gn.
 # They rely on the environment variable or otherwise use chromium's default of
 # 2015.
 # TODO(machenbach): For switching to msvs 2015, simply remove this.
-MSVS_VERSION = '2013'
+MSVS_VERSION = '2015'
 
 
 def main(args):
   mbw = MetaBuildWrapper()
   return mbw.Main(args)
 
 
 class MetaBuildWrapper(object):
   def __init__(self):
     self.chromium_src_dir = CHROMIUM_SRC_DIR
@@ skipping 1449 matching lines @@
   # Then check to see if the arg contains any metacharacters other than
   # double quotes; if it does, quote everything (including the double
   # quotes) for safety.
   if any(a in UNSAFE_FOR_CMD for a in arg):
     arg = ''.join('^' + a if a in ALL_META_CHARS else a for a in arg)
   return arg
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))