Remove traces of removed Mac/Win GN builders.

scripts/slave/recipe_modules/chromium_tests/chromium_win.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_win.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_win.py b/scripts/slave/recipe_modules/chromium_tests/chromium_win.py
index 8e6adfbd5bab2033099203c55171abf09e2470a1..a1e94ef80e37808d8de4474612e54046f49b95c1 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_win.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_win.py
@@ -148,30 +148,6 @@ SPEC = {
       },
       'enable_swarming': True,
     },
-    'Win8 Aura': {
-      # TODO(dpranke): Remove after masters have restarted.
-      'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
-      'gclient_config': 'chromium',
-      'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Release',
-        'TARGET_PLATFORM': 'win',
-        'TARGET_BITS': 32,
-      },
-      'test_generators': [
-        steps.generate_gtest,
-        steps.generate_script,
-        steps.generate_isolated_script,
-      ],
-      'enable_swarming': True,
-      'swarming_dimensions': {
-        'cpu': 'x86-64',
-        'os': 'Windows-8.1-SP0',
-      },
-      'testing': {
-        'platform': 'win',
-      },
-    },
     'Win8 GYP': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb'],
@@ -252,26 +228,6 @@ SPEC = {
       },
       'enable_swarming': True,
     },
-    'Win8 GN (dbg)': {
-      # TODO(dpranke): Remove after masters have restarted.
-      'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
-      'gclient_config': 'chromium',
-      'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Debug',
-        'TARGET_PLATFORM': 'win',
-        'TARGET_BITS': 32,
-      },
-      'test_generators': [
-        steps.generate_gtest,
-        steps.generate_script,
-        steps.generate_isolated_script,
-      ],
-      'enable_swarming': True,
-      'testing': {
-        'platform': 'win',
-      },
-    },
     'Win8 GYP (dbg)': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb'],