Flip Win x86 builder on chromium waterfall to GN.

tools/mb/mb_config.pyl

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   # This is a map of buildbot master names -> buildbot builder names ->
   # config names (where each config name is a key in the 'configs' dict,
   # below). MB uses this dict to look up which config to use for a given bot.
   'masters': {
     # Take care when changing any of these builders to ensure that you do not
     # include a configuration with 'chrome_with_codecs' since these builders
     # generated publicly advertised non-Official builds which are not allowed
     # to have proprietary codecs enabled.
     'chromium': {
       'Android': 'android_without_codecs_gn_release_bot_minimal_symbols',
       'Linux x64': 'noswarming_gn_release_bot',
       'Mac': 'noswarming_gn_release_bot_mac_strip',
-      'Win': 'noswarming_gyp_release_bot_minimal_symbols_x86',
+      'Win': 'noswarming_gn_release_bot_minimal_symbols_x86',
       'Win x64': 'noswarming_gn_release_bot_minimal_symbols_x64',
     },
 
     'chromium.android': {
       'Android Cronet ARM64 Builder':
           'android_cronet_gn_release_bot_minimal_symbols_arm64',
       'Android Cronet ARM64 Builder (dbg)':
           'android_cronet_gn_debug_static_bot_arm64',
       'Android Cronet ARMv6 Builder':
           'android_cronet_gn_release_bot_minimal_symbols_armv6',
@@ skipping 1406 matching lines @@
     ],
 
     'noswarming_gn_release_bot_minimal_symbols_x64': [
       'noswarming', 'gn', 'release_bot', 'minimal_symbols', 'x64',
     ],
 
     'noswarming_gn_release_bot_minimal_symbols_x86': [
       'noswarming', 'gn', 'release_bot', 'minimal_symbols', 'x86',
     ],
 
-    'noswarming_gyp_release_bot_minimal_symbols_x86': [
-      'noswarming', 'gyp', 'release_bot', 'minimal_symbols', 'x86',
-    ],
-
     'noswarming_gn_release_bot_x64': [
       'noswarming', 'gn', 'release_bot', 'x64',
     ],
 
     'noswarming_gn_release_bot_mac_strip': [
       'noswarming', 'gn', 'release_bot', 'mac_strip',
     ],
 
     'noswarming_gn_release_trybot_x64': [
       'noswarming', 'gn', 'release_trybot', 'x64',
@@ skipping 861 matching lines @@
     },
 
     'drfuzz': { 'gn_args': 'use_drfuzz=true' },
 
     'drmemory': {
       'gn_args': 'is_component_build=true enable_iterator_debugging=false',
       'gyp_defines': 'component=shared_library build_for_tool=drmemory',
     },
   },
 }