WebRTC: Move over to new baremetal machines

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': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_clang_dbg',
       'android_compile_dbg',
       'android_compile_rel',
       'android_compile_arm64_dbg',
       'android_compile_arm64_rel',
       'android_compile_x86_dbg',
       'android_compile_x64_dbg',
       'android_gn_dbg',
@@ skipping 14 matching lines @@
       'linux_ubsan_vptr',
       'presubmit',
     ],
     'hostname': 'slave%d-c4' % i,
   } for i in range(719, 726) + range(777, 779) + range(837, 841)
 ] + [
   # Linux bare-metal machines with Android devices.
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_dbg',
     ],
     'hostname': 'build%d-a4' % i,
   } for i in range(77, 79)
 ] + [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_arm64_rel',
     ],
     'hostname': 'build204-a4',
   },
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_n6',
     ],
     'hostname': 'build39-b4',
   },
 ] + [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_rel',
     ],
     'hostname':  'build%d-b4' % i,
   } for i in range(46, 49)
 ] + [
   # Linux bare-metal machines with audio devices and headsets.
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'linux_baremetal',
     ],
     'hostname': 'build22-a4',
   }
 ] + [
   # Mac.
   {
     'master': 'WebRTCTryServer',
@@ skipping 24 matching lines @@
 ] + [
   # Mac bare-metal machines with audio devices and headsets.
   {
     'master': 'WebRTCTryServer',
     'os': 'mac',
     'version': '10.10',
     'bits': '64',
     'builder': [
       'mac_baremetal',
     ],
-    'hostname': 'build24-a4',
+    'hostname': 'build123-b4',
   }
 ] + [
   # Windows.
   {
     'master': 'WebRTCTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'win_compile_dbg',
@@ skipping 23 matching lines @@
     'master': 'WebRTCTryServer',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'win_baremetal',
     ],
     'hostname': 'build23-a4',
   }
 ]