Note that this unforks, windows ninja is now built from martine/ninja.

TBR=iannucci@chromium.org

Review URL: https://codereview.chromium.org/10947018

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@157451 0039d316-1c4b-4281-b951-d872f2087c98