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The ARC side has used the new icon request mojom interfaces, so the old
icon request mojom interfaces in the Chromium side can be removed.

BUG=1083331

Change-Id: I8421d58c035564ca6e9b944775bec85a11f4d5c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2346093Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Long Cheng <lgcheng@google.com>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808974}