build_gyp: Remove deprecated flag, which is enabled by default.

build_gyp/standalone.gypi

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Definitions to be used when building stand-alone PDFium binaries.
 
 {
   'variables': {
     'component%': 'static_library',
     'chromium_code%': 0,
@@ skipping 83 matching lines @@
               # no need to load it dynamically.
               'clang_dynlib_flags%': '',
             }],
             ['OS=="android" or OS=="linux"', {
               'clang_plugin_check_ipc_arg': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-ipc',
             }, {
               'clang_plugin_check_ipc_arg': '',
             }],
           ],
           'clang_plugin_args%': '-Xclang -plugin-arg-find-bad-constructs -Xclang check-templates '
-          '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion '
-          '-Xclang -plugin-arg-find-bad-constructs -Xclang check-implicit-copy-ctors ',
+          '-Xclang -plugin-arg-find-bad-constructs -Xclang follow-macro-expansion ',
         },
         'clang_chrome_plugins_flags%':
           '<(clang_dynlib_flags)'
           '-Xclang -add-plugin -Xclang find-bad-constructs <(clang_plugin_args) <(clang_plugin_check_ipc_arg)',
       }],
     ],
   },
   'target_defaults': {
     'default_configuration': 'Debug',
     'configurations': {
@@ skipping 467 matching lines @@
       ],
     }],  # OS=="win"
     ["use_goma==1", {
       'make_global_settings': [
         ['CC_wrapper', '<(gomadir)/gomacc'],
         ['CXX_wrapper', '<(gomadir)/gomacc'],
       ],
     }],  # use_goma==1
   ],
 }