Update to Chrome 30

* vendor/brightray 50b282a...e1b7ff2 (2):
  > Merge pull request #30 from brightray/chrome-30
  > Update to latest libchromiumcontent
Update #includes for moves of string-related headers

See http://src.chromium.org/viewvc/chrome?view=revision&revision=205050.
Update for changes to V8's SetAccessor API

See http://code.google.com/p/v8/source/detail?r=15239.
Merge pull request #16 from brightray/chrome-30

Update to Chrome 30