Cleanup: remove someof MediaTrack's stable flags and correct ImageCapture ones

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:
 // https://w3c.github.io/mediacapture-main/#mediadevices
 // https://w3c.github.io/mediacapture-main/#mediadevices-interface-extensions
 
 [
     ActiveScriptWrappable,
     DependentLifetime,
 ] interface MediaDevices : EventTarget {
     [RuntimeEnabled=OnDeviceChange] attribute EventHandler ondevicechange;
     [CallWith=ScriptState, MeasureAs=MediaDevicesEnumerateDevices] Promise<sequence<MediaDeviceInfo>> enumerateDevices();
-    [RuntimeEnabled=MediaConstraints] MediaTrackSupportedConstraints getSupportedConstraints();
+    MediaTrackSupportedConstraints getSupportedConstraints();
     [RuntimeEnabled=GetUserMedia,
      CallWith=ScriptState,
      RaisesException,
      MeasureAs=GetUserMediaPromise
     ] Promise<MediaStream> getUserMedia(optional MediaStreamConstraints constraints);
 };