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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/.

A similar CL was landed and reverted:
https://chromium.googlesource.com/chromium/src.git/+/53ffdf90f4646dbde8df72007fbdc97f3f0220de

BUG=397642, 306348
TEST=Manually tested on 10.6-10.10.

Review URL: https://codereview.chromium.org/561833006

Cr-Commit-Position: refs/heads/master@{#294382}