GN: Replace Windows suppressions of warning 4267 with config.

webrtc/modules/audio_processing/BUILD.gn

 # Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("//build/config/arm.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 189 matching lines @@
     if (mips_float_abi == "hard") {
       sources += [
         "aec/aec_core_mips.cc",
         "aec/aec_rdft_mips.cc",
       ]
     }
   } else {
     sources += [ "aecm/aecm_core_c.cc" ]
   }
 
-  if (is_win) {
-    cflags = [
-      # TODO(jschuh): Bug 1348: fix this warning.
-      "/wd4267",  # size_t to int truncations
-    ]
-  }
+  # TODO(jschuh): Bug 1348: fix this warning.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
   if (is_clang) {
     # Suppress warnings from Chrome's Clang plugins.
     # See http://code.google.com/p/webrtc/issues/detail?id=163 for details.
     configs -= [ "//build/config/clang:find_bad_constructs" ]
   }
 
   deps += [
     "../../base:rtc_base_approved",
     "../../common_audio",
@@ skipping 66 matching lines @@
       "../../common_audio",
     ]
 
     if (aec_debug_dump) {
       defines = [ "WEBRTC_AEC_DEBUG_DUMP=1" ]
     } else {
       defines = [ "WEBRTC_AEC_DEBUG_DUMP=0" ]
     }
   }
 }