Default to VS2013

Switch the default toolchain to VS2013, attempt N.

There will be WebKit image diffs on Windows, but they appear to be all
rebaseline-able minor changes.

TBR=cpu@chromium.org
BUG=309197

Review URL: https://codereview.chromium.org/185203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@254340 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed