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This is a partial revert of crrev.com/c/1694962. I was going to use frame size
by AssignPictureBuffers(). However, the frame size is also known by
ImportBufferForPicture(). The frame size in AssignPictureBuffers() even can be
wrong in secure mode. So I would dealy and call VDA::AssignPictureBuffers()
in GAVDA::ImportBufferForPicture on the first picture buffer. So the mojo change
and GAVDA change in crrev.com/c/1694962 is unnecessary.
NOTE: I haven't changed ARC++ and ChromeOS side for this mojo change. So it is
safe to revert the mojo change.

Bug: 979115
Test: None
Change-Id: Ie8f7f3dd9e4b104ed2e590379ec86e88ad76e708
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1720298
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682662}