Remove invalid compiler arg:

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.
 
 {
   'closure_args': [
-    'accept_const_keyword',
     'compilation_level=SIMPLE_OPTIMIZATIONS',
     'extra_annotation_name=attribute',
     'extra_annotation_name=demo',
     'extra_annotation_name=element',
     'extra_annotation_name=group',
     'extra_annotation_name=homepage',
     'extra_annotation_name=status',
     'extra_annotation_name=submodule',
     'jscomp_error=accessControls',
     'jscomp_error=ambiguousFunctionDecl',
-    'jscomp_error=checkStructDictInheritance',
     'jscomp_error=checkTypes',
     'jscomp_error=checkVars',
     'jscomp_error=constantProperty',
     'jscomp_error=deprecated',
     'jscomp_error=externsValidation',
     'jscomp_error=globalThis',
     'jscomp_error=invalidCasts',
     'jscomp_error=missingProperties',
     'jscomp_error=missingReturn',
     'jscomp_error=nonStandardJsDocs',
@@ skipping 10 matching lines @@
     'summary_detail_level=3', # compile.py depends on this for output parsing; do not override.
   ],
   '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',
   ]
 }