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This reverts commit e3dd922b.

Reason for revert: Broke uprev. See crbug.com/1161061 .

Original change's description:
> Implement skeleton of emoji_picker using Polymer.
>
> Very basic skeleton of the interface with search box and list of
> emoji. Currently draws emoji into groups from the emoji_ordering.json
> file. There is also a row of icons (currently not rendering).
>
> Some changes to BUILD.gn have been made to build the components
> using Polymer. This allows us to write template in html and have them
> imported into the js component code (see `__html_template__` placeholders)
>
> Bug: 1152237
> Change-Id: Ie7f803ba8c2f45d136e81ae2f6b0dd95d616fd27
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591988
> Commit-Queue: Kenton Lam <kentonlam@google.com>
> Reviewed-by: Keith Lee <keithlee@chromium.org>
> Reviewed-by: John Palmer <jopalmer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#837808}

TBR=keithlee@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,jopalmer@chromium.org,kentonlam@google.com

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

Bug: 1152237,1161061
Change-Id: Iac67f04f64629bf2e2ec7aa62fb1b2978f14a514
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600318Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838794}