Use brightray's gyp instead of requiring it to be installed

* vendor/brightray b542fb3...b4e5b5e (13):
  > Merge pull request #28 from brightray/vendor-gyp
  > Make overriding BrowserContext::RegisterPrefs actually work
  > Mention that Clang 3.0 is needed on Linux
  > Merge pull request #26 from brightray/linux
  > Merge pull request #25 from brightray/getusermedia
  > Put ICU headers on the include path for embedders
  > Update libchromiumcontent to get ICU headers
  > Avoid a crash when starting a download by disallowing downloads
  > Rename the Helper process to Renderer/Plug-In Host/Utility as appropriate
  > Allow clients to supply their own NetworkDelegate implementation
  > Update to latest libchromiumcontent
  > Always build 32-bit in Xcode
  > Merge pull request #24 from brightray/skmatrix
Merge pull request #14 from brightray/vendor-gyp

Use brightray's gyp instead of requiring it to be installed