WebRTC: Move over to new baremetal machines

masters/master.tryserver.webrtc/slaves.cfg

Index: masters/master.tryserver.webrtc/slaves.cfg
diff --git a/masters/master.tryserver.webrtc/slaves.cfg b/masters/master.tryserver.webrtc/slaves.cfg
index c964a1f763e783dca73033837da4351c687fc004..800e1313b54d4bb258ef05e6d15325e460dbe380 100644
--- a/masters/master.tryserver.webrtc/slaves.cfg
+++ b/masters/master.tryserver.webrtc/slaves.cfg
@@ -7,7 +7,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_clang_dbg',
@@ -42,7 +42,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_dbg',
@@ -53,7 +53,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_arm64_rel',
@@ -63,7 +63,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_n6',
@@ -74,7 +74,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'android_rel',
@@ -86,7 +86,7 @@ slaves = [
   {
     'master': 'WebRTCTryServer',
     'os': 'linux',
-    'version': 'precise',
+    'version': 'trusty',
     'bits': '64',
     'builder': [
       'linux_baremetal',
@@ -131,7 +131,7 @@ slaves = [
     'builder': [
       'mac_baremetal',
     ],
-    'hostname': 'build24-a4',
+    'hostname': 'build123-b4',
   }
 ] + [
   # Windows.