BUG=554638
TBR=maruel
TESTED=locally verified that two deps can be rolled

Review URL: https://codereview.chromium.org/1445833003 .

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@297553 0039d316-1c4b-4281-b951-d872f2087c98