Mark editing/selection/move-left-right.html for rebaseline

TBR=tkent@chromium.org
BUG=331301

Review URL: https://codereview.chromium.org/171683005

git-svn-id: svn://svn.chromium.org/blink/trunk@167412 bbb929c8-8fbe-4397-9dbb-9b2b20218538