Update existing uses of /wd4267 to use the GN config

content/shell/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/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 207 matching lines @@
     "renderer/test_runner/web_task.cc",
     "renderer/test_runner/web_task.h",
     "renderer/test_runner/web_test_delegate.h",
     "renderer/test_runner/web_test_interfaces.cc",
     "renderer/test_runner/web_test_interfaces.h",
     "renderer/test_runner/web_test_proxy.cc",
     "renderer/test_runner/web_test_proxy.h",
     "renderer/test_runner/web_test_runner.h",
   ]
 
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
   defines = [ "CONTENT_SHELL_VERSION=\"$content_shell_version\"" ]
 
   public_deps = [
     # This exposes all public content APIs.
     "//content/public/app:both",
     "//content/public/browser",
     "//content/public/common",
     "//content/public/plugin",
     "//content/public/renderer",
     "//content/public/utility",
@@ skipping 35 matching lines @@
     "//v8",
 
     #'copy_test_netscape_plugin',  TODO(GYP)
   ]
   if (enable_plugins) {
     deps += [ "//content/ppapi_plugin" ]
   }
 
   if (is_win) {
     #'LinkIncremental': '<(msvs_large_module_debug_link_mode)',  TODO(GYP)
-
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
     sources += [
       "common/v8_breakpad_support_win.cc",
       "common/v8_breakpad_support_win.h",
     ]
   }
 
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
   }
 
@@ skipping 226 matching lines @@
       # image diff rather than having content shell depend on it.
       datadeps = [
         "//tools/imagediff($host_toolchain)",
       ]
     }
   }
 } else {
   group("content_shell") {
   }
 }