Fix runtest test to handle internal way of specifying chromeos.
Fix runtest test to handle internal way of specifying chromeos.

I haven't found a situation where this hits us yet, though I expect
fixing the internal trunk builder may land us there real-soon-now.

BUG=None
TEST=None

Review URL: http://codereview.chromium.org/9369031

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@121355 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build