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The AppService (and specifically app_service/arc_apps.cc) currently uses
the ARC_GET_INSTANCE_FOR_METHOD macro directly, which is really a
private implementation detail of the ArcAppListPrefs class and its
friends, such as ArcAppIcon and ArcAppIconLoader.

A follow-up CL, adding ArcAppIcon support for providing compressed
icons, will let us delete the ARC_GET_INSTANCE_FOR_METHOD macros in
app_service/arc_apps.cc.

BUG=826982

Change-Id: Ifc5a88deea2693c2fe4c6c1ae3fe0b33661dbee3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758024Reviewed-by: Yury Khmel <khmel@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689728}