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This CL removes the debug variable |num_frames_at_client_| since it's
always equal to the difference between pictures_.size() and
available_picture_buffers_.size().

Test: Checked in crosvideo and v_d_a_unittests that the values are ==.
Bug: 721674
Change-Id: I946192bde8368210c4b65cf0084c34ee86ea3e62
Reviewed-on: https://chromium-review.googlesource.com/c/1357554Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613089}