Set DEPOT_TOOLS_WIN_TOOLCHAIN=0 by default (issue #1304).

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1731 5089003a-bbd8-11dd-ad1f-f1f9622dbc98
Remove duplicate content in file.

git-svn-id: http://chromiumembedded.googlecode.com/svn/trunk/cef3@1734 5089003a-bbd8-11dd-ad1f-f1f9622dbc98