Remove V8 dependency from blink_platform
Remove V8 dependency from blink_platform

Previously landed in https://src.chromium.org/viewvc/blink?view=rev&revision=161116,
but now builds on Windows thanks to a Chromium-side dependency fix in
https://src.chromium.org/viewvc/chrome?view=rev&revision=233696.

Review URL: https://codereview.chromium.org/54893003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161656 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs