Remove Linux ARM Compile from main waterfall.

scripts/slave/recipe_modules/chromium_tests/chromium_linux.py

 # Copyright 2014 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-linux-archive',
     # WARNING: src-side runtest.py is only tested with chromium CQ builders.
     # Usage not covered by chromium CQ is not supported and can break
     # without notice.
     'src_side_runtest_py': True,
   },
   'builders': {
-    'Linux ARM': {
-      'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb', 'ninja_confirm_noop'],
-      'gclient_config': 'chromium',
-      'chromium_config_kwargs': {
-        'BUILD_CONFIG': 'Release',
-        'TARGET_ARCH': 'arm',
-        'TARGET_BITS': 32,
-      },
-      'bot_type': 'builder',
-      'compile_targets': [
-        'chromium_builder_tests',
-      ],
-      'use_isolate': True,
-      'testing': {
-        'platform': 'linux',
-      },
-    },
     'Linux Builder': {
       'chromium_config': 'chromium',
       'chromium_apply_config': ['mb', 'ninja_confirm_noop'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
         'TARGET_BITS': 64,
       },
       'bot_type': 'builder',
       'compile_targets': [
@@ skipping 498 matching lines @@
         'TARGET_BITS': 32,
         'TARGET_PLATFORM': 'android',
       },
       'android_config': 'cast_builder',
       'testing': {
         'platform': 'linux',
       },
     },
   },
 }