Win10 - Remove temp 1909/1803 bots

These were FYI and trybots that were used to validate new win10 version.
Removing buildbot and mb configurations for these bots.

Bug: 1124829
Change-Id: I42f41dd233dc2d8e3de19c0de6dd35a8f68413f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517980Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Ian Struiksma <ianstruiksma@google.com>
Cr-Commit-Position: refs/heads/master@{#823680}

testing/buildbot/mixins.pyl

@@ -839,20 +839,6 @@
       },
     },
   },
-  'win10-1803': {
-    'swarming': {
-      'dimensions': {
-        'os': 'Windows-10-17134',
-      },
-    },
-  },
-  'win10-1909': {
-    'swarming': {
-      'dimensions': {
-        'os': 'Windows-10-18363',
-      },
-    },
-  },
   # TODO(crbug.com/1087153): Remove this once the fleet is upgraded to 1909.
   'win10_1803_intel_hd_630': {
     'swarming': {

testing/buildbot/test_suite_exceptions.pyl

@@ -290,15 +290,6 @@
           'Debug_x64',
         ],
       },
-      'Win10 Tests x64 1909': {
-        'args': [
-          '--target',
-          'Release_x64',
-        ],
-        'swarming': {
-          "shards": 28
-        },
-      },
       'Win7 Tests (dbg)(1)': {
         'args': [
           '--debug',

testing/buildbot/waterfalls.pyl

@@ -2158,26 +2158,6 @@
         },
         'use_swarming': False,
       },
-      'Win10 Tests x64 1803': {
-        'mixins': [
-          'x86-64',
-          'win10-1803',
-        ],
-        'test_suites': {
-          'gtest_tests': 'chromium_win_gtests',
-          'isolated_scripts': 'chromium_win_rel_isolated_scripts',
-        },
-      },
-      'Win10 Tests x64 1909': {
-        'mixins': [
-          'x86-64',
-          'win10-1909',
-        ],
-        'test_suites': {
-          'gtest_tests': 'chromium_win_gtests',
-          'isolated_scripts': 'chromium_win_rel_isolated_scripts',
-        },
-      },
       'android-code-coverage': {
         'mixins': [
           'bullhead',

tools/mb/mb_config.pyl

@@ -271,7 +271,6 @@
       'Site Isolation Android': 'android_release_bot_minimal_symbols_arm64',
       'VR Linux': 'vr_release_bot',
       'Win 10 Fast Ring': 'release_trybot',
-      'Win10 Tests x64 1909': 'gpu_tests_release_bot_minimal_symbols',
       'android-code-coverage': 'gpu_tests_android_release_bot_minimal_symbols_arm64_fastbuild_java_coverage',
       'android-code-coverage-native': 'gpu_tests_android_release_bot_minimal_symbols_arm64_fastbuild_native_coverage',
       'android-marshmallow-arm64-16-core': 'gpu_tests_android_release_trybot_arm64_fastbuild',
@@ -1090,7 +1089,6 @@
       'win10_chromium_x64_dbg_ng': 'gpu_tests_debug_bot',
       'win10_chromium_x64_rel_ng': 'gpu_tests_release_trybot_resource_whitelisting_code_coverage',
       'win10_chromium_x64_rel_ng_exp': 'release_trybot',
-      'win10_chromium_x64_1909_fyi_rel_ng': 'gpu_tests_release_trybot',
       'win10-inverse-fieldtrials-fyi-rel': 'gpu_tests_release_trybot_invert_fieldtrials',
       'win-annotator-rel': 'release_trybot',
       'win-asan': 'asan_clang_fuzzer_static_v8_heap_minimal_symbols_release',

tools/mb/mb_config_expectations/chromium.fyi.json

@@ -204,16 +204,6 @@
       "use_goma": true
     }
   },
-  "Win10 Tests x64 1909": {
-    "gn_args": {
-      "ffmpeg_branding": "Chrome",
-      "is_component_build": false,
-      "is_debug": false,
-      "proprietary_codecs": true,
-      "symbol_level": 1,
-      "use_goma": true
-    }
-  },
   "android-code-coverage": {
     "gn_args": {
       "disable_android_lint": true,

tools/mb/mb_config_expectations/tryserver.chromium.win.json

@@ -294,17 +294,6 @@
       "use_goma": true
     }
   },
-  "win10_chromium_x64_1909_fyi_rel_ng": {
-    "gn_args": {
-      "dcheck_always_on": true,
-      "ffmpeg_branding": "Chrome",
-      "is_component_build": false,
-      "is_debug": false,
-      "proprietary_codecs": true,
-      "symbol_level": 1,
-      "use_goma": true
-    }
-  },
   "win10_chromium_x64_dbg_ng": {
     "gn_args": {
       "ffmpeg_branding": "Chrome",