Win/GN: Make no_exception config explicit.

build/config/win/BUILD.gn

 # Copyright (c) 2013 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/clang/clang.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/win/visual_studio_version.gni")
 import("//build/toolchain/toolchain.gni")
 
@@ skipping 153 matching lines @@
 # that is Windows-only. Please see that target for advice on what should go in
 # :runtime_library vs. :compiler.
 config("runtime_library") {
   cflags = []
 
   # Defines that set up the CRT.
   defines = [
     "__STD_C",
     "_CRT_RAND_S",
     "_CRT_SECURE_NO_DEPRECATE",
-    "_HAS_EXCEPTIONS=0",
     "_SCL_SECURE_NO_DEPRECATE",
   ]
 
   # Defines that set up the Windows SDK.
   defines += [
     "_ATL_NO_OPENGL",
     "_WINDOWS",
     "CERT_CHAIN_PARA_HAS_EXTRA_FIELDS",
     "NTDDI_VERSION=0x0A000000",
     "PSAPI_VERSION=1",
@@ skipping 214 matching lines @@
 
 # Internal stuff --------------------------------------------------------------
 
 # Config used by the MIDL template to disable warnings.
 config("midl_warnings") {
   if (is_clang) {
     # MIDL generates code like "#endif !_MIDL_USE_GUIDDEF_".
     cflags = [ "-Wno-extra-tokens" ]
   }
 }