Blink gardening: image rebase on Linux

BUG=N/A
TBR=enne@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/26331008

git-svn-id: svn://svn.chromium.org/blink/trunk@159207 bbb929c8-8fbe-4397-9dbb-9b2b20218538