Update V8 DEPS.
Update V8 DEPS.

Rolling v8/tools/clang to 5489bbf01a5292a6c44d4cad7875ba2cb4ac975b

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/903233003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26499}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh