libyuv: Switch {client,tryserver}.libyuv to GN

masters/master.client.libyuv/master_win_cfg.py

Index: masters/master.client.libyuv/master_win_cfg.py
diff --git a/masters/master.client.libyuv/master_win_cfg.py b/masters/master.client.libyuv/master_win_cfg.py
index 50b25d059e435318feb9642022d01a5cd192a6b2..98b0218a73d38f33afdbe6ba9898ea39b915916c 100644
--- a/masters/master.client.libyuv/master_win_cfg.py
+++ b/masters/master.client.libyuv/master_win_cfg.py
@@ -30,8 +30,8 @@ def Update(c):
           'Win32 Release (Clang)',
           'Win64 Debug (Clang)',
           'Win64 Release (Clang)',
-          'Win64 Debug (GN)',
-          'Win64 Release (GN)',
+          'Win64 Debug (GYP)',
+          'Win64 Release (GYP)',
       ]),
   ])
 
@@ -52,8 +52,8 @@ def Update(c):
     {'name': 'Win32 Release (Clang)', 'slavebuilddir': 'win_clang'},
     {'name': 'Win64 Debug (Clang)', 'slavebuilddir': 'win_clang'},
     {'name': 'Win64 Release (Clang)', 'slavebuilddir': 'win_clang'},
-    {'name': 'Win64 Debug (GN)', 'slavebuilddir': 'win64_gn'},
-    {'name': 'Win64 Release (GN)', 'slavebuilddir': 'win64_gn'},
+    {'name': 'Win64 Debug (GYP)', 'slavebuilddir': 'win64_gyp'},
+    {'name': 'Win64 Release (GYP)', 'slavebuilddir': 'win64_gyp'},
   ]
 
   c['builders'].extend([