Use corrected Google WebRTC binary to prevent class name conflicts in iOS 13

[mjjimenez]

As previously discussed, GoogleWebRTC binary has naming conflicts with some of iOS's classes that may cause a crash in some devices. Reference: https://github.com/stasel/WebRTC-iOS/issues/19

Also in the same issue someone has a.) Created step by step guide on how to rename the classes and rebuild the library from scratch https://github.com/stasel/WebRTC-iOS/issues/19#issuecomment-579498664 and b.) Provided a pre-built binary. https://github.com/stasel/WebRTC-iOS/issues/19#issuecomment-579660304

We should test the pre-built binary if it doesn't cause anymore warnings or crashes. But for production, we need to follow the steps above in building the library from scratch for security purposes.