Remove old NeedsManualRebaseline

R=jochen@chromium.org

NOTRY=true
BUG=

Review URL: https://codereview.chromium.org/163063002

git-svn-id: svn://svn.chromium.org/blink/trunk@167074 bbb929c8-8fbe-4397-9dbb-9b2b20218538