Default to VS2013 on Windows

This switches the default toolchain on Windows to VS2013.

TBR=cpu@chromium.org
BUG=323300,309197

Review URL: https://codereview.chromium.org/178263005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253993 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed