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We realized that MediaElementEventQueue : target is not 1 : 1. Then,
Having MediaElementEventQueue own a target doesn't make sense. This CL
enforces to set a target of an event before enqueuing and use it when
dispatching.

Bug: 846618
Change-Id: Iacc19e6c55040fe05e4883fa33f570b3424650e0
Reviewed-on: https://chromium-review.googlesource.com/1105803Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568403}