WebRTC: Update Macs to 10.10 (with Xcode 7)

masters/master.client.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 32-bit.
   {
     'master': 'WebRTC',
     'os': 'linux',
     'version': 'precise',
@@ skipping 103 matching lines @@
     'builder': [
       'Android64 Tests (L Nexus9)',
     ],
     'hostname': 'build34-a3',
   },
 ] + [
   # Mac.
   {
     'master': 'WebRTC',
     'os': 'mac',
-    'version': '10.8',
+    'version': '10.10',
     'bits': '64',
     'builder': [
       'iOS32 Debug',
       'iOS32 Release',
       'iOS64 Debug',
       'iOS64 Release',
       'iOS32 Simulator Debug',
       'iOS64 Simulator Debug',
       'Mac32 Debug',
       'Mac32 Release',
       'Mac64 Debug',
       'Mac64 Release',
       'Mac64 Debug (GN)',
       'Mac64 Release (GN)',
       'Mac Asan',
     ],
     'hostname': 'vm%d-m3' % i,
-  } for i in range(672, 674) + [612, 677]
+  } for i in range(672, 675) + [612, 677]

[phoglund_chromium, 2015/11/16 09:36:54]

Where did you move 675 from? Is that the one you mention in the CL description?
If so, where is it removed from its old place?

[kjellander_chromium, 2015/11/16 09:45:12]

This change only adds 674 (from masters/master.client.webrtc.fyi/slaves.cfg). 
Remember that range(x,y) doesn't include y (just y-1)

[phoglund_chromium, 2015/11/16 10:16:42]

Ok, just checking.

 ] + [
   # Mac, bare-metal.
   {
     'master': 'WebRTC',
     'os': 'mac',
-    'version': '10.8',
+    'version': '10.10',
     'bits': '64',
     'builder': [
       'Mac32 Release [large tests]',
     ],
     'hostname': 'build23-a3',
   },
 ] + [
   # Windows.
   {
     'master': 'WebRTC',
@@ skipping 38 matching lines @@
     'master': 'WebRTC',
     'os': 'win',
     'version': 'win7',
     'bits': '64',
     'builder': [
       'Win32 Release [large tests]',
     ],
     'hostname': 'chromeperf90',
   }
 ]