VideoCaptureDeliverFrameCB: Remove unused scaled_video_frames param.

Autumn cleaning...
As of [1], all code paths set it to {}, so we can delete it.

Follow-up CLs will continue to follow the trail of {} and delete the
scaled buffers parameters of other interfaces.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/4895665

# Skipping unrelated linux-chromeos-rel misbehaving
NOTRY=True

Bug: chromium:1440075
Change-Id: I2e1a038c5060416c32e863b20eb716cf4c3a0767
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4896467
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Mark Foltz <mfoltz@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Fabian Sommer <fabiansommer@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1207062}