Mojo C++ bindings GYP build: only unset "-Wglobal-constructors' for unittests depending on WTF type…

mojo/mojo_public.gyp

 # Copyright 2014 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.
 
 {
   'includes': [
     'mojo_variables.gypi',
   ],
   'target_defaults' : {
     'include_dirs': [
@@ skipping 221 matching lines @@
         # This comes from the mojo_interface_bindings_cpp_sources dependency.
         '>@(mojom_generated_sources)',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         'mojo_cpp_system',
         'mojo_interface_bindings_cpp_sources',
       ],
     },
     {
+      # TODO(yzshen): crbug.com/617718 Consider moving this into blink.
       # GN version: //mojo/public/cpp/bindings:wtf_support
       'target_name': 'mojo_cpp_bindings_wtf_support',
       'type': 'static_library',
       'include_dirs': [
         '..'
       ],
       'sources': [
         'public/cpp/bindings/array_traits_wtf.h',
         'public/cpp/bindings/array_traits_wtf_vector.h',
         'public/cpp/bindings/lib/string_traits_wtf.cc',
         'public/cpp/bindings/lib/wtf_serialization.h',
         'public/cpp/bindings/string_traits_wtf.h',
         'public/cpp/bindings/wtf_array.h',
       ],
       'dependencies': [
         'mojo_cpp_bindings',
         '../third_party/WebKit/Source/config.gyp:config',
         '../third_party/WebKit/Source/wtf/wtf.gyp:wtf',
       ],
       'export_dependent_settings': [
         'mojo_cpp_bindings',
         '../third_party/WebKit/Source/config.gyp:config',
       ],
-      'direct_dependent_settings': {
-        'variables': {
-          'clang_warning_flags_unset': [ '-Wglobal-constructors' ],
-        },
-      },
     },
     {
       # GN version: //mojo/message_pump
       'target_name': 'mojo_message_pump_lib',
       'type': '<(component)',
       'defines': [
         'MOJO_MESSAGE_PUMP_IMPLEMENTATION',
       ],
       'dependencies': [
         '../base/base.gyp:base',
@@ skipping 253 matching lines @@
              'mojo_interface_bindings_java_sources',
              'mojo_public_java',
              '<(DEPTH)/base/base.gyp:base_java',
            ],
            'includes': [ '../build/java.gypi' ],
         },
       ],
     }],
   ],
 }