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Conjoins omnibox's transparency UI and the NTP realbox's removal UI on
omnibox::kOmniboxSuggestionTransparencyOptions.

Note: this leaves the keyboard shortcut (Shift+Delete) intentionally
enabled, as this is what Omnibox does.

R=mahmadi@chromium.org

Bug: 1002689
Change-Id: Iffdbd7a94567fce3352c0b7611229f9ddb4846b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861275Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705813}