Update the V8 version for Chromium branch 77.

This is a roll-back to V8 7.7.299. This is the most stable candidate out of the latest Canaries.

If this commit results in failures in Blink please contact the Blink sheriff. They may need to make changes to Blink because of the roll-back.

When in doubt please try to contact the committer and reviewers of this CL before reverting it.

R=machenbach@chromium.org

Change-Id: I7db4ed01b421ecfb25f6926306cd96614bd1e42e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717289
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680793}