Flip win_chromium_rel_ng to GN, remove win8_chromium_ng from the CQ.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index e73e51a2efb24085093f8e4df04e5c3272704773..adf70e128b745f37035f0eee78ff8e42ce2f570d 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -605,7 +605,7 @@
 
     'chromium.win': {
       # Windows bots take too long to link w/ full symbols and time out.
-      'Win Builder': 'swarming_gyp_release_bot_minimal_symbols_x86',
+      'Win Builder': 'swarming_gn_release_bot_minimal_symbols_x86',
       'Win Builder (dbg)': 'swarming_gn_debug_bot_minimal_symbols_x86',
       'Win x64 Builder': 'swarming_gn_release_bot_minimal_symbols_x64',
       'Win x64 Builder (dbg)': 'swarming_gn_debug_bot_minimal_symbols_x64',
@@ -869,7 +869,7 @@
       'win_chromium_compile_rel_ng':
         'swarming_gpu_tests_gn_release_trybot_x86',
       'win_chromium_dbg_ng': 'swarming_gn_debug_trybot_x86',
-      'win_chromium_rel_ng': 'swarming_gpu_tests_gyp_release_trybot_x86',
+      'win_chromium_rel_ng': 'swarming_gpu_tests_gn_release_trybot_x86',
       'win_chromium_syzyasan_rel': 'swarming_gyp_syzyasan_release_trybot_x86',
       'win_chromium_variable': 'findit',
       'win_chromium_variable_archive': 'findit',
@@ -1602,10 +1602,6 @@
       'swarming', 'gn', 'release_bot_minimal_symbols', 'x86',
     ],
 
-    'swarming_gyp_release_bot_minimal_symbols_x86': [
-      'swarming', 'gyp', 'release_bot_minimal_symbols', 'x86',
-    ],
-
     'swarming_gn_release_bot_x64': [
       'swarming', 'gn', 'release_bot', 'x64',
     ],
@@ -1684,10 +1680,6 @@
       'swarming', 'gpu_tests', 'gn', 'release_trybot', 'x86',
     ],
 
-    'swarming_gpu_tests_gyp_release_trybot_x86': [
-      'swarming', 'gpu_tests', 'gyp', 'release_trybot', 'x86',
-    ],
-
     'swarming_gpu_tests_gyp_debug_trybot': [
       'swarming', 'gpu_tests', 'gyp', 'debug_trybot',
     ],