Remove warning suppression for Wexpansion-to-defined violation for Opus

third_party/opus/opus.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'conditions': [
       ['target_arch=="arm" or target_arch=="arm64"', {
         'use_opus_fixed_point%': 1,
       }, {
@@ skipping 41 matching lines @@
     ],
   },
   'targets': [
     {
       'target_name': 'opus',
       'type': 'static_library',
       'defines': [
         'OPUS_BUILD',
         'OPUS_EXPORT=',
       ],
-      'variables': {
-        'clang_warning_flags': [
-          # TODO(thakis): Remove once silk/macros.h has been fixed
-          '-Wno-expansion-to-defined',
-        ],
-      },
       'include_dirs': [
         'src/celt',
         'src/include',
         'src/silk',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           'src/include',
         ],
       },
@@ skipping 165 matching lines @@
       'type': 'executable',
       'dependencies': [
         'opus'
       ],
       'sources': [
         'src/tests/test_opus_padding.c',
       ],
     },  # target test_opus_padding
   ]
 }