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

scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py b/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
index b54de440e06440517e3e151a7df1fd71ddc27846..9eae59e6101b73b75b088d8ae303af21d368516c 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_gpu_fyi.py
@@ -752,15 +752,13 @@ SPEC = {
     },
     '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': [
       ],
@@ -777,15 +775,13 @@ SPEC = {
     },
     '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': [
       ],