Version 3.31.45 (based on 779076e0069be546659ca1b6c95247fc36c5c0a1)

Update all DEPS to match chromium's DEPS at edb488e.

Turn on DCHECKs and other debugging code if dcheck_always_on is 1 (issue 3731).

Optimize GetPrototype.

Performance and stability improvements on all platforms.

Cr-Commit-Position: refs/heads/candidates@{#25320}