Turn down 10.10 macOS trybots.

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 .pyl, or "Python Literal", file. You can treat it just like a
 # .json file, with the following exceptions:
 # * all keys must be quoted (use single quotes, please);
 # * comments are allowed, using '#' syntax; and
 # * trailing commas are allowed.
 
@@ skipping 563 matching lines @@
       'linux_upload_clang': 'release_bot',
     },
 
     'tryserver.chromium.mac': {
       'ios-device': 'ios',
       'ios-device-xcode-clang': 'ios',
       'ios-simulator': 'ios',
       'ios-simulator-eg': 'ios',
       'ios-simulator-cronet': 'ios',
       'ios-simulator-xcode-clang': 'ios',
-      'mac_chromium_10.10_rel_ng': 'gpu_tests_release_trybot',
       'mac_chromium_10.10_macviews': 'mac_views_browser_release_trybot',
       'mac_chromium_10.12_rel_ng': 'gpu_tests_release_trybot',
       'mac_chromium_archive_rel_ng': 'release_bot_mac_strip',
       'mac_chromium_asan_rel_ng': 'asan_dcheck_disable_nacl_release_bot',
       'mac_chromium_compile_dbg_ng': 'debug_trybot',
       'mac_chromium_compile_rel_ng': 'gpu_tests_release_trybot',
       'mac_chromium_dbg_ng': 'debug_trybot',
       'mac_chromium_gn_upload': 'release_bot',
       'mac_chromium_rel_ng': 'gpu_tests_release_trybot',
       'mac_nacl_sdk': 'release_bot',
@@ skipping 1369 matching lines @@
 
     'x64': {
       'gn_args': 'target_cpu="x64"',
     },
 
     'x86': {
       'gn_args': 'target_cpu="x86"',
     },
   },
 }