Update existing uses of /wd4267 to use the GN config

third_party/re2/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.
 
 config("re2_config") {
   include_dirs = [ "." ]
 }
 
 static_library("re2") {
   sources = [
@@ skipping 40 matching lines @@
     "util/sparse_array.h",
     "util/sparse_set.h",
     "util/stringpiece.cc",
     "util/stringprintf.cc",
     "util/strutil.cc",
     "util/utf.h",
     "util/util.h",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
-  configs += [ "//build/config/compiler:no_chromium_code" ]
+  configs += [
+    "//build/config/compiler:no_chromium_code",
+    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+    "//build/config/compiler:no_size_t_to_int_warning",
+  ]
   public_configs = [ ":re2_config" ]
 
   deps = [
     "//base/third_party/dynamic_annotations",
   ]
 
   if (is_win) {
     include_dirs = [ "mswin" ]
-    cflags = [
-      "/wd4267",  # Conversion from size_t.
-      "/wd4722",  # Destructor never terminates.
-    ]
+    cflags = [ "/wd4722" ]  # Destructor never terminates.
   } else {
     sources -= [ "mswin/stdint.h" ]
   }
 }