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This CL changes RewriteKeyEventInContext to use the new API.
Before this CL, EventRewriterChromeOS::NextDispatchEvent sends the
events from StickyKeysControllers and the events generated in
RewriteKeyEventInContext. Now, RewriteKeyEventInContext takes
Continuation as an argument and sends all generated events without
storing them in dispatched_key_events_ and gets events from
StickyKeysController if it has pending events.
As the result, we can remove dispatched_key_events_ field and
EventRewriterChromeOS::NextDispatchEvent.
However, EventRewriteStatus is still used inside EventRewriterChromeOS,
so we can't clean up them yet.

Bug: 1049489
Test: unit_tests
Change-Id: I41109afa57bc1407beab6ab264bcbfc992d9f1ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056526
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Reviewed-by: Mitsuru Oshima (OOO) <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743440}