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This is the follow up for CL:2251600. Modify the ARC code to use the
new mojom interfaces and structure RawIconPngData.

TODO: Add some test cases for the adaptive icon.

Design doc: go/appservice-adaptive-icon

BUG=1083331

Change-Id: I1600d11af9a6477e6923f8e1f43d79fa52cf79f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2286251
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Long Cheng <lgcheng@google.com>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790631}