Modify roll_dep's commit message
Modify roll_dep's commit message

This conforms to the convention of using a single-line short description
followed by an empty line followed by a long description. Shortened the
revisions to more easily fit on one line.

BUG=408700

Review URL: https://codereview.chromium.org/513383002

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@291743 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools