Remove Windows/AMD from chromium.gpu and win_chromium_rel_ng.

masters/master.chromium.gpu/slaves.cfg

Index: masters/master.chromium.gpu/slaves.cfg
diff --git a/masters/master.chromium.gpu/slaves.cfg b/masters/master.chromium.gpu/slaves.cfg
index c19c51fbd9c431439a274be907ad4399a89dfc1e..d9c0285190f7977b23eca1ace6494bd30ff95237 100644
--- a/masters/master.chromium.gpu/slaves.cfg
+++ b/masters/master.chromium.gpu/slaves.cfg
@@ -59,20 +59,6 @@ slaves = [
   },
   {
     'master': 'ChromiumGPU',
-    'hostname': 'vm101-m1',
-    'builder': 'Win7 Release (ATI)',
-    'os': 'win',
-    'version': 'win7',
-    'bits': '64',
-    'recipe': 'chromium',
-    'build_config': 'Release',
-    # This bot uses recipe-side triggers.
-    'triggered_by': 'none',
-    # Nearly all bots on these waterfalls are auto-rebooted between
-    # runs for stability.
-  },
-  {
-    'master': 'ChromiumGPU',
     'hostname': 'vm612-m1',
     'builder': 'GPU Mac Builder',
     'os': 'mac',