Update V8 DEPS.
Update V8 DEPS.

Rolling v8/tools/clang to cb9ddad752c487e2f4df2bf32df70daaa9afded5

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1103043002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28052}

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