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CL:2424854 changed automation event generation and as a result some ARC
events are dispatched duplicately. Specially, value range change events
are dispatched twice, and tast test started to fail.

This change fixes it by changing the event type that ARC dispatches from
value changed event to aria attribute changed so that we can delegate
AXEventGenerator to generate this type of event.

AX-Relnotes: n/a
Bug: b:169201305
Test: tast arc.AccessiblityEvent
Test: unit_test AXTreeSourceArcTest,ArcAccessibilityUtilTest
Change-Id: Ie635619c13d605b0bf9ec3633f9ac5eb0109f89e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2462883
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Auto-Submit: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816388}