Flip GN bots to be purely driven by //testing/buildbot/*.json files for tests.

scripts/slave/recipe_modules/chromium/api.py

 # Copyright 2013 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.
 
 import re
 
 from recipe_engine import recipe_api
 from recipe_engine import util as recipe_util
 
 from . import builders
@@ skipping 586 matching lines @@
     args += [
         '//out/%s' % self.c.build_config_fs
     ]
 
     # This runs with no env being passed along, so we get a clean environment
     # without any GYP_DEFINES being present to cause confusion.
     self.m.python(name='generate_build_files',
                   script=self.m.path['checkout'].join('tools', 'mb', 'mb.py'),
                   args=args)
 
-  def run_gn_check(self):
-    # TODO(dpranke): Figure out if we should use the '_x64' thing to
-    # consistent w/ GYP, or drop it to be consistent w/ the other platforms.
-    build_dir = '//out/%s' % self.c.build_config_fs
-
-    self.m.python(
-        name='gn check',
-        script=self.m.path['depot_tools'].join('gn.py'),
-        args=[
-            '--root=%s' % str(self.m.path['checkout']),
-            'check',
-            build_dir,
-        ])
-
   def taskkill(self):
     self.m.python(
       'taskkill',
       self.m.path['build'].join('scripts', 'slave', 'kill_processes.py'))
 
   def cleanup_temp(self):
     self.m.python(
       'cleanup_temp',
       self.m.path['build'].join('scripts', 'slave', 'cleanup_temp.py'))
 
@@ skipping 146 matching lines @@
             '--output', self.m.json.output(),
             '--',
         ] + self.get_common_args_for_scripts(),
         step_test_data=lambda: self.m.json.test_api.output({}))
 
   def download_lto_plugin(self):
     return self.m.python(
         name='download LTO plugin',
         script=self.m.path['checkout'].join(
             'build', 'download_gold_plugin.py'))