In order to minimize bisection ranges when the roll breaks, we want to update the chromium_revision as often as possible. Even if a roll doesn't bring in changed dependencies or Clang version, it still brings in changes in the Chromium build toolchain. The description now contains links to all dependencies that change (if any). BUG=webrtc:4688 R=phoglund@webrtc.org Review URL: https://codereview.webrtc.org/1381963003 . Cr-Commit-Position: refs/heads/master@{#10141}