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Change link to help (question mark) vector icon.
Removed close (X) button from ConfirmBubbleView dialog bubble.

TBR=lazyboy@chromium.org

Bug: 654139
Change-Id: I99e58f98d449d83b0aaea3aa49acfd71912a6ea5
Reviewed-on: https://chromium-review.googlesource.com/871183
Commit-Queue: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531895}