The deprecated v8_index.h was removed from the Chromium tree in r19291 and upstreamed into WebKit with r45193. However V8IsolatedWorld slipped in between the cracks and broke the build.
Created attachment 31879 [details] patch
Can't review, but as the one who landed the break, LGTM.
Comment on attachment 31879 [details] patch LGTM.