Mostly happening on Mac. Will investigate later.

TBR=dpranke
BUG=
TEST=

Review URL: http://codereview.chromium.org/6696094

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79354 0039d316-1c4b-4281-b951-d872f2087c98