Rolling v8/third_party/icu to a05f412f70489b77da0ddeb8baa31c68e3eff2c6

Rolling v8/tools/clang to 69fd1b485a2b24c872bfa4759342076751c9d490

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1176273002

Cr-Commit-Position: refs/heads/master@{#28917}