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Currently arc_a11y_helper_bridge converts mojom actions to android
actions, however it's cleaner if this handling is done in arc_a11y_util.

Bug: b/145316954
Test: refactoring
Test: ArcAccessibilityHelperBridgeTest.* passes
Change-Id: I48e1367a479bfc2d44664c2c4de6ce96eda44daf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975478
Commit-Queue: Sara Kato <sarakato@chromium.org>
Reviewed-by: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732245}