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After Web MIDI started using mojo, MIDIAccessor,
MIDIAccessInitializer, and MIDIDispatcher classes
do not much work any more.

As the first step to simplify these unnecessary
layering, this patch removes MIDIAccessor layer.

Bug: 582328
Change-Id: I9377d7afab56eefe96f6818d089af54d5f4d80d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718465
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681172}