cc/ipc: Fix size_t to int implicit cast

cc/ipc/BUILD.gn

 # Copyright 2016 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.
 
 component("ipc") {
   output_name = "cc_ipc"
 
   defines = [ "CC_IPC_IMPLEMENTATION" ]
 
   sources = [
     "cc_ipc_export.h",
     "cc_param_traits.cc",
     "cc_param_traits.h",
     "cc_param_traits_macros.h",
   ]
 
-  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
-
   public_deps = [
     "//cc",
     "//cc/surfaces",
   ]
 
   deps = [
     "//base",
     "//gpu/ipc/common",
     "//ipc",
     "//skia",
     "//ui/events/ipc",
     "//ui/gfx",
     "//ui/gfx/ipc",
     "//ui/gfx/ipc/geometry",
     "//ui/gfx/ipc/skia",
   ]
 }