iOS: Rename GYP builders for iOS.

masters/master.client.webrtc/master_mac_cfg.py

Index: masters/master.client.webrtc/master_mac_cfg.py
diff --git a/masters/master.client.webrtc/master_mac_cfg.py b/masters/master.client.webrtc/master_mac_cfg.py
index b2909d54cbfa2cdf85521ad405841348c368a49a..6102e0e14e57e7f0786daac8dbc19b4c3063b1cd 100644
--- a/masters/master.client.webrtc/master_mac_cfg.py
+++ b/masters/master.client.webrtc/master_mac_cfg.py
@@ -41,8 +41,8 @@ def Update(c):
           'iOS64 Release',
           'iOS32 Simulator Debug',
           'iOS64 Simulator Debug',
-          'iOS64 Debug (GN)',
-          'iOS64 Release (GN)',
+          'iOS64 Debug (GYP)',
+          'iOS64 Release (GYP)',
           'iOS API Framework Builder',
       ]),
   ])
@@ -91,13 +91,13 @@ def Update(c):
       'recipe': 'webrtc/ios',
     },
     {
-      'name': 'iOS64 Debug (GN)',
-      'slavebuilddir': 'mac64_gn',
+      'name': 'iOS64 Debug (GYP)',
+      'slavebuilddir': 'mac64_gyp',
       'recipe': 'webrtc/ios',
     },
     {
-      'name': 'iOS64 Release (GN)',
-      'slavebuilddir': 'mac64_gn',
+      'name': 'iOS64 Release (GYP)',
+      'slavebuilddir': 'mac64_gyp',
       'recipe': 'webrtc/ios',
     },
     {