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This factors DefaultEventGeneratorDelegate out to a separate file and uses it in
chromecast/.  It also adds a default ScreenPositionClient getter to
EventGeneratorDelegateAura and removes the duplicate overrides in various
subclasses.

Bug: none
Change-Id: I449cf1c10daa4a23b197679dcb428acbbe54a52f
Reviewed-on: https://chromium-review.googlesource.com/c/1338577
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609094}