Update brightray to be based on Chrome 28

* vendor/brightray fdc5a74...b542fb3 (7):
  > Update libchromiumcontent to be based on Chrome 28
  > Merge pull request #23 from brightray/ninja
  > Update to latest libchromiumcontent
  > Give BrowserContext subclasses access to GetPath()
  > Merge pull request #20 from brightray/windows-dev-tools
  > Merge pull request #19 from brightray/file-protocol-handler
  > Don't crash when HTML notifications are used on Windows
Allow the integrated GPU on MacBook Pros to be used for accelerated content