Update existing uses of /wd4267 to use the GN config

jingle/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")
 
 if (enable_webrtc || !is_android) {
   jingle_includes = exec_script("//build/gypi_to_gn.py",
                                 [ rebase_path("jingle.gypi") ],
                                 "scope",
                                 [ "jingle.gypi" ])
 
   # GYP version: jingle/jingle.gyp:jingle_glue
   static_library("jingle_glue") {
     sources = jingle_includes.jingle_glue_sources
     public_deps = [
       "//third_party/libjingle",
     ]
     deps = [
       "//base",
       "//base/third_party/dynamic_annotations",
       "//net",
     ]
+
+    configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
   }
 
   # A library for sending and receiving peer-issued notifications.
   # GYP version: jingle/jingle.gyp:notifier
   static_library("notifier") {
     sources = [
       "notifier/base/const_communicator.h",
       "notifier/base/gaia_constants.cc",
       "notifier/base/gaia_constants.h",
       "notifier/base/gaia_token_pre_xmpp_auth.cc",
@@ skipping 152 matching lines @@
     ]
     deps = [
       "//base",
       "//net",
     ]
   }
 
   source_set("notifier_test_util") {
   }
 }