This is analogous to the change made in
https://codereview.chromium.org/559243002/.  I want to change ARB to use the
commit message generated by roll-dep.

BUG=408700

Review URL: https://codereview.chromium.org/564363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@291975 0039d316-1c4b-4281-b951-d872f2087c98