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For the context menu for suggestions project, this adds the
confirmation bubble for Remove Suggestion (from history).

This bubble is not yet hooked up to anything, but is just the UI.

Screenshots here: go/context-menu-for-suggestions

Bug: 929477
Change-Id: I60b7c481c45bb2d1c61584961ad8f69a86e7f9b1
Reviewed-on: https://chromium-review.googlesource.com/c/1461328Reviewed-by: manuk hovanesian <manukh@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630571}