Remove Chromium's custom closure runner.

third_party/closure_compiler/closure_args.gypi

 # 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.
 
 # GN version: third_party/closure_compiler/closure_args.gni
 {
   'default_closure_args': [
     'compilation_level=SIMPLE_OPTIMIZATIONS',
 
     # Keep this in sync with chrome/browser/web_dev_style/js_checker.py.
@@ skipping 21 matching lines @@
     'jscomp_error=suspiciousCode',
     'jscomp_error=undefinedNames',
     'jscomp_error=undefinedVars',
     'jscomp_error=unknownDefines',
     'jscomp_error=uselessCode',
     'jscomp_error=visibility',
 
     'language_in=ECMASCRIPT6_STRICT',
     'language_out=ECMASCRIPT5_STRICT',
 
+    'checks_only',
+    'chrome_pass',
     'polymer_pass',
 
     'source_map_format=V3',
   ],
 
   'default_disabled_closure_args': [
     # TODO(dbeam): happens when the same file is <include>d multiple times.
     'jscomp_off=duplicate',
     # TODO(fukino): happens when cr.defineProperty() has a type annotation.
     # Avoiding parse-time warnings needs 2 pass compiling. crbug.com/421562.
     'jscomp_off=misplacedTypeAnnotation',
   ],
 }