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This reverts commit 6769a912.

Reason for revert: Causing crashes (https://crbug.com/1142672)

Original change's description:
> [ShareCCT] Implement sharing in the toolbar and by default in CCT.
>
> Bug: 1135311
> Change-Id: I967300591d383a21b9f3f40233422b763180ddb0
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459403
> Reviewed-by: Tanya Gupta <tgupta@chromium.org>
> Reviewed-by: Andrew Grieve <agrieve@chromium.org>
> Reviewed-by: Peter Conn <peconn@chromium.org>
> Commit-Queue: Sophey Dong <sophey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#820029}

TBR=agrieve@chromium.org,peconn@chromium.org,tgupta@chromium.org,sophey@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1135311, 1142672
Change-Id: Id0a3d68fc60893c39eef76c6fa79379dfe8faf2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500591Reviewed-by: Krishna Govind <govind@chromium.org>
Commit-Queue: Krishna Govind <govind@chromium.org>
Auto-Submit: Sophey Dong <sophey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821101}