Make ready to unprefix getUserMedia, and counters

third_party/WebKit/Source/modules/mediastream/MediaDevices.idl

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // The spec for MediaDevices is in two parts:
 // http://w3c.github.io/mediacapture-main/#mediadevices
 // http://w3c.github.io/mediacapture-main/#mediadevices-interface-extensions
 
 [
     ActiveScriptWrappable,
     DependentLifetime,
     ConstructorCallWith=ExecutionContext,
     RuntimeEnabled=MediaDevices
 ]
 interface MediaDevices : EventTarget {
     [CallWith=ScriptState, MeasureAs=MediaDevicesEnumerateDevices] Promise<sequence<MediaDeviceInfo>> enumerateDevices();
     [RuntimeEnabled=MediaConstraints] MediaTrackSupportedConstraints getSupportedConstraints();
-    [RuntimeEnabled=GetUserMedia, CallWith=ScriptState, RaisesException] Promise<MediaStream> getUserMedia(MediaStreamConstraints options);
+    [RuntimeEnabled=GetUserMedia,
+     CallWith=ScriptState,
+     RaisesException,
+     MeasureAs=GetUserMediaPromise
+    ] Promise<MediaStream> getUserMedia(MediaStreamConstraints options);
     [RuntimeEnabled=OnDeviceChange] attribute EventHandler ondevicechange;
 };