Update V8 DEPS.
Update V8 DEPS.

Rolling v8/tools/clang to 52a578929068131eb73e907fdd6e2600e0d3180c

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1133463003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#28289}

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