Remove old 2013 toolchain script from tools/win/

This functionality for 2013 now lives in depot_tools.

TBR=maruel@chromium.org
BUG=323300

Review URL: https://codereview.chromium.org/150003008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249029 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249029