[Telemetry] Disable webrtc.multiple_peerconnections story.

tools/perf/page_sets/webrtc_cases.py

 # Copyright 2014 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.
 
 from telemetry import story
 from telemetry.page import page as page_module
 
 
 class WebrtcPage(page_module.Page):
 
@@ skipping 118 matching lines @@
     self.AddStory(VideoCall(self, tags=['peerconnection', 'smoothness']))
     self.AddStory(DataChannel(self, tags=['datachannel']))
     self.AddStory(CanvasCapturePeerConnection(self, tags=['smoothness']))
     # TODO(qyearsley, mcasas): Add webrtc.audio when http://crbug.com/468732
     # is fixed, or revert https://codereview.chromium.org/1544573002/ when
     # http://crbug.com/568333 is fixed.
     # self.AddStory(AudioCall(self, 'OPUS'))
     # self.AddStory(AudioCall(self, 'G772'))
     # self.AddStory(AudioCall(self, 'PCMU'))
     # self.AddStory(AudioCall(self, 'ISAC/1600'))
+
+
+class WebrtcExpectations(story.expectations.StoryExpectations):
+  def SetExpectations(self):
+    self.DisableStory('multiple_peerconnections', [story.expectations.ALL],
+                      'crbug.com/725502')