Remove invalid compiler arg:

ios/web/js_compile_checked.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.
 
 # This file should be identical to js_compile.gypi except it passes jscomp_error
 # flags to the compiler. One should prefer this over js_compile.gypi once the
 # JS code being compiled are error free.
 #
 # This file should be eventually deprecated in favor of
 # third_party/closure_compiler/compile_js.gypi once they have the same set of
@@ skipping 16 matching lines @@
             '<(SHARED_INTERMEDIATE_DIR)/<(RULE_INPUT_NAME)',
           ],
           'action': [
             'java',
             '-jar',
             '<(closure_compiler_path)',
             '--compilation_level',
             'SIMPLE_OPTIMIZATIONS',
             '--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 22 matching lines @@
           'action': [
             'cp',
             '<(RULE_INPUT_PATH)',
             '<@(_outputs)',
           ],
         }
       ]}  # rule_name: jscompilation
     ]  # condition: compile_javascript
   ]  # conditions
 }