[Android] Switch chromium.gpu.fyi Android bots to arm64.

scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py

 # 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.
 
 from . import steps
 
 SPEC = {
   'settings': {
     'build_gs_bucket': 'chromium-gpu-fyi-archive',
     # WARNING: src-side runtest.py is only tested with chromium CQ builders.
@@ skipping 734 matching lines @@
       ],
       'bot_type': 'tester',
       'parent_buildername': 'GPU Mac Builder (dbg)',
       'testing': {
         'platform': 'mac',
       },
       'enable_swarming': True,
     },
     'Android Debug (Nexus 5X)': {
       'chromium_config': 'android',
-      'chromium_apply_config': ['chrome_with_codecs', 'mb'],
+      'chromium_apply_config': ['chrome_with_codecs'],
       'gclient_config': 'chromium',
       'gclient_apply_config': ['android'],
       'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Debug',
-        'TARGET_BITS': 32,
         'TARGET_PLATFORM': 'android',
       },
-      'android_config': 'main_builder',
+      'android_config': 'arm64_builder_mb',
       'bot_type': 'builder_tester',
       'compile_targets': [
       ],
       'test_generators': [
         steps.generate_gtest,
         steps.generate_isolated_script,
         steps.generate_script,
       ],
       'testing': {
         'platform': 'linux',
       },
       'use_isolate': False,
       'enable_swarming': False,
     },
     'Android Debug (Nexus 9)': {
       'chromium_config': 'android',
-      'chromium_apply_config': ['chrome_with_codecs', 'mb'],
+      'chromium_apply_config': ['chrome_with_codecs'],
       'gclient_config': 'chromium',
       'gclient_apply_config': ['android'],
       'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Debug',
-        'TARGET_BITS': 32,
         'TARGET_PLATFORM': 'android',
       },
-      'android_config': 'main_builder',
+      'android_config': 'arm64_builder_mb',
       'bot_type': 'builder_tester',
       'compile_targets': [
       ],
       'test_generators': [
         steps.generate_gtest,
         steps.generate_isolated_script,
         steps.generate_script,
       ],
       'testing': {
         'platform': 'linux',
@@ skipping 185 matching lines @@
         'aura_builder',
       ],
       'testing': {
         'platform': 'linux',
       },
       'enable_swarming': False,
       'use_isolate': True,
     },
   },
 }