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The KeywordHintView should be dark in incognito mode in touch. Fix.

This patch also fixes a bug where the KeywordHintView would not update itself if
the browser window was resized with it showing.

See screenshots -
https://drive.google.com/file/d/1RM2TC9Wg3Js6UCrntkWc808pj_S3A59b/view?usp=sharing

Bug: 830328
Change-Id: If9bb98d447454d34448cd9d63d31e6afc471cecc
Reviewed-on: https://chromium-review.googlesource.com/1004714Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550511}