don't use VS subdir for 2013 toolchain builder

Was causing some problems with $(VCInstallDir) in gyp files, just put
it in the root of the toolchain, the same as the 2010 script.

R=cpu@chromium.org
TBR=cpu@chromium.org
BUG=309197

Review URL: https://codereview.chromium.org/69383003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234417 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed