Might have caused

ninja: error: '..\..\third_party\qunit\src', needed by 'remoting\unittests\qunit\src', missing and no known rule to make it

on the windows bots.

BUG=389683

Review URL: https://codereview.chromium.org/341253004

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@280434 0039d316-1c4b-4281-b951-d872f2087c98