Deprecate Media.FrameInfo.GuessedCodedSizeChangeSuccess histogram.

Basically 98-99% all the time, no reason to keep at this time. We'll
still have the initial coded size guess one.

OBSOLETE_HISTOGRAM[Media.FrameInfo.GuessedCodedSizeChangeSuccess]=This histogram is no longer needed.

R=evliu

Fixed: 407543487
Change-Id: Ief3a8d4e60b6b8cff14917eb7caf8019b3388abd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6418582
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Evan Liu <evliu@google.com>
Commit-Queue: Evan Liu <evliu@google.com>
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1440596}