Update existing uses of /wd4267 to use the GN config

third_party/harfbuzz-ng/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/linux/pkg_config.gni")
 
 # The GYP build supports system harfbuzz for non-official builds when using
 # pangoft2 1.31.0 or greater (which pulls it in).
 # TODO(brettw) we can consider doing this as well, although the benefit is
 # unclear and requires shelling out to a script to check the version.
@@ skipping 144 matching lines @@
     deps = [
       "//third_party/icu:icuuc",
     ]
 
     cflags = []
     if (is_clang) {
       cflags += [ "-Wno-unused-value" ]
     }
     if (is_win) {
       cflags += [
-        "/wd4267",  # size_t to 'type' converion.
         "/wd4334",  # Result of 32-bit shift implicitly converted to 64 bits.
       ]
     }
     if (is_mac) {
       sources += [
         "src/hb-coretext.cc",
         "src/hb-coretext.h",
       ]
       defines += [ "HAVE_CORETEXT" ]
     }
   }
 }