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This CL applies pending_receiver to CreateVideoEncodeAccelerator()
in VideoEncodeAccelerator interface.

 - Convert InterfaceRequest to mojo::PendingReceiver
 - Convert mojo::MakeStrongBinding to mojo::MakeSelfOwnedReceiver

Bug: 955171
Change-Id: Id3d3237e8d3687c2ac4d18b7965530239ef83d10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833004Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Gyuyoung Kim <gyuyoung@igalia.com>
Cr-Commit-Position: refs/heads/master@{#704921}