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This CL removes some unneeded ash includes and fixes the only ash
vector icon dependency in src/chrome.

Bug: 798569
Change-Id: I17acd7fb17dc5716f639606b7da31f7e123a13ad
Reviewed-on: https://chromium-review.googlesource.com/1110997Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570060}