Rolling v8/build/gyp to 79de4031069f37870f04e8b6bbf42f0c7fec37aa

Rolling v8/tools/clang to 66ba82eea5b4e2309c220cc3e0f2d67ebc3fff4c

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/1187073008

Cr-Commit-Position: refs/heads/master@{#29035}