Move Win x64 clobber bot and remove Win x64 GN bots.

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 1dc4ff063adb38aa9fd0127d8ed8fcfdbc794a2d..e7ebdd2a35a420f879c770d3d44ae19fde61d7eb 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_win.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_win.py
@@ -148,25 +148,6 @@ SPEC = {
       },
       'enable_swarming': True,
     },
-    'Win x64 GN': {
-      'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
-      'gclient_config': 'chromium',
-      'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Release',
-        'TARGET_PLATFORM': 'win',
-        'TARGET_BITS': 64,
-      },
-      'test_generators': [
-        steps.generate_gtest,
-        steps.generate_script,
-        steps.generate_isolated_script,
-      ],
-      'enable_swarming': True,
-      'testing': {
-        'platform': 'win',
-      },
-    },
     'Win8 Aura': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb'],
@@ -244,25 +225,6 @@ SPEC = {
       },
       'enable_swarming': True,
     },
-    'Win x64 GN (dbg)': {
-      'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
-      'gclient_config': 'chromium',
-      'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Debug',
-        'TARGET_PLATFORM': 'win',
-        'TARGET_BITS': 64,
-      },
-      'test_generators': [
-        steps.generate_gtest,
-        steps.generate_script,
-        steps.generate_isolated_script,
-      ],
-      'enable_swarming': True,
-      'testing': {
-        'platform': 'win',
-      },
-    },
     'Win8 GN (dbg)': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb'],