WebRTC: Remove Dr Memory bots.

masters/master.tryserver.webrtc/slaves.cfg

 # Copyright (c) 2012 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.
 
 slaves = [
   # Linux.
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
     'version': 'trusty',
@@ skipping 116 matching lines @@
       'win_rel',
       'win_x64_dbg',
       'win_x64_rel',
       'win_x64_gyp_dbg',
       'win_x64_gyp_rel',
       'win_clang_dbg',
       'win_clang_rel',
       'win_x64_clang_dbg',
       'win_x64_clang_rel',
       'win_asan',
-      'win_drmemory_light',
-      'win_drmemory_full',
       'win_swarming',
     ],
     'hostname': 'vm%d-m4' % i,
   } for i in range(207, 209) + [133, 212, 234, 263, 363, 407, 495]
 ] + [
   # Windows bare-metal machines with audio devices and headsets.
   {
     'master': 'WebRTCTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'win_baremetal',
     ],
     'hostname': hostname,
   } for hostname in ['build143-b4', 'build139-b4']
 ]