Rolling v8/build/gyp to 2f9ffdc96135eaa102ee90584e7c6e5e5c45915c

TBR=machenbach@chromium.org,vogelheim@chromium.org,hablich@chromium.org

Review URL: https://codereview.chromium.org/1701613002

Cr-Commit-Position: refs/heads/master@{#33968}