Update existing uses of /wd4267 to use the GN config

content/child/BUILD.gn

 # 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.
 
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//content/child/child.gni")
 
 source_set("child") {
@@ skipping 79 matching lines @@
         "npapi/webplugin_ime_win.h",
       ]
     } else if (is_android) {
       sources -= [ "npapi/webplugin_delegate_impl_android.cc" ]
     }
     if (use_aura) {
       sources -= [ "npapi/webplugin_delegate_impl_aura.cc" ]
     }
   }
 
-  configs += [ "//content:content_implementation" ]
+  configs += [
+    "//content:content_implementation",
+    "//build/config/compiler:no_size_t_to_int_warning",
+  ]
 
   if (is_ios) {
     # iOS only needs a small portion of content; exclude all the
     # implementation, and re-include what is used.
     sources = []
   } else {
     deps += [
       "//content/app/resources",
       "//content/app/strings",
       "//crypto:platform",
@@ skipping 16 matching lines @@
   if (!use_openssl) {
     sources += rebase_path(content_child_gypi_values.webcrypto_nss_sources,
                            ".",
                            "//content")
   } else {
     sources += rebase_path(content_child_gypi_values.webcrypto_openssl_sources,
                            ".",
                            "//content")
   }
 }