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This CL surfaces the "Why this suggestion" text in the bubble for
removing suggestions.

Suggestions that can be removed now have a "More Info / Remove..."
context menu entry. Suggestions that cannot be removed have a
"More info..." context menu entry.

Both bring up a bubble.

This won't be the final UX treatment, but gets the capability in there
for further refinement.

Bug: 929477
Change-Id: I2dc9a5fea920653ead8ff9efea41fb77f91ff919
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1575872
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652870}