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Revert of [Extensions] Enable sideloading prompt on mac on canary (patchset #3 id:40001 of https://codereview.chromium.org/2623033002/ )

Reason for revert:
Broke official mac compile

Original issue's description:
> [Extensions] Enable sideloading prompt on mac on canary
>
> BUG=669277
>
> Review-Url: https://codereview.chromium.org/2623033002
> Cr-Commit-Position: refs/heads/master@{#442983}
> Committed: https://chromium.googlesource.com/chromium/src/+/e7419b3ea146e6aa9ba26ec3fae255754f47cafb

TBR=lazyboy@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=669277

Review-Url: https://codereview.chromium.org/2628993002
Cr-Commit-Position: refs/heads/master@{#442993}