GitLab

This adds an X close button on removable suggestions, assuming the
user has the kOmniboxSuggestionTransparencyOptions flag enabled.

A followup CL will remove the context menu, so there will be no code
duplication.

Bug: 1205, 929477
Change-Id: I7c921c6051dc4f53fc55e9bd5922d827968735da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1834247
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702159}