message: Wrench createNewMatrixCall straight out of call
  rather than importing browser-index
diff: @@ -59,7 +59,7 @@ import {MatrixClientPeg} from './MatrixClientPeg';
  import PlatformPeg from './PlatformPeg';
  import Modal from './Modal';
  import { _t } from './languageHandler';
  -import Matrix from 'matrix-js-sdk/src/browser-index';
  +import { createNewMatrixCall } from 'matrix-js-sdk/src/webrtc/call';
  import dis from './dispatcher/dispatcher';
  import WidgetUtils from './utils/WidgetUtils';
  import WidgetEchoStore from './stores/WidgetEchoStore';
  @@ -362,7 +362,7 @@ export default class CallHandler {
  ) {
  Analytics.trackEvent('voip', 'placeCall', 'type', type);
  CountlyAnalytics.instance.trackStartCall(roomId, type === PlaceCallType.Video, false);
  - const call = Matrix.createNewMatrixCall(MatrixClientPeg.get(), roomId);
  + const call = createNewMatrixCall(MatrixClientPeg.get(), roomId);
  this.calls.set(roomId, call);
  this.setCallListeners(call);
  this.setCallAudioElement(call);
  