Add lint tools to WebRTC and fix lint errors 
diff --git a/webrtc/RTCPeerConnection-peerIdentity.html b/webrtc/RTCPeerConnection-peerIdentity.html index 845c55d..d5f9db9 100644 --- a/webrtc/RTCPeerConnection-peerIdentity.html +++ b/webrtc/RTCPeerConnection-peerIdentity.html 
@@ -284,7 +284,7 @@  pc2.setRemoteDescription(offer))  .then(() =>  assert_rtcerror_rejection('idp-execution-failure', - peerIdentityPromise, + peerIdentityPromise1,  `Expect first peerIdentity promise to be rejected with RTCError('idp-execution-failure')`))  .then(() => {  const peerIdentityPromise2 = pc2.peerIdentity;