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Now using a mojom struct containing:
- text
- icon URL (optional)
- action URL (optional)

Icon URL will be used to fetch an icon for a suggestion chip view.

Action URL, when specified, dictates a different action to be taken
on suggestion tap/click.

Handling of icon/action URLs will come in follow up CL.

Bug: b:78236856
Change-Id: I04c489285250ccb395cfe54c465a696c8539f619
Reviewed-on: https://chromium-review.googlesource.com/1050906
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557753}