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The connection is only needed during sandbox warmup to initialize the default
color space. It was formerly needed by scrollbar NSAnimations, but that was
replaced via https://codereview.chromium.org/529103002/.

BUG=397642,306348
TEST=Manually tested on 10.6-10.10.
R=avi@chromium.org

Review URL: https://codereview.chromium.org/545603002

Cr-Commit-Position: refs/heads/master@{#293546}