Rolling v8/build/gyp to 2b17e0b26a93e8c9758c23aec6c554da4ca8f0a9

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

Review URL: https://codereview.chromium.org/1324213006

Cr-Commit-Position: refs/heads/master@{#30601}