Update existing uses of /wd4267 to use the GN config

base/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/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 851 matching lines @@
     sources -= [
       "message_loop/message_pump_libevent.cc",
       "strings/string16.cc",
 
       # Not using sha1_win.cc because it may have caused a
       # regression to page cycler moz.
       "sha1_win.cc",
     ]
 
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
+    configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 
     libs = [
       "cfgmgr32.lib",
       "netapi32.lib",
       "powrprof.lib",
       "setupapi.lib",
     ]
     ldflags = [
       "/DELAYLOAD:cfgmgr32.dll",
       "/DELAYLOAD:powrprof.dll",
@@ skipping 138 matching lines @@
     ":base",
     "//base/third_party/dynamic_annotations",
     "//third_party/icu",
   ]
 
   if (is_android && !is_debug) {
     configs -= [ "//build/config/compiler:optimize" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 
-  if (is_win) {
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
-  }
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
 
 source_set("prefs") {
   sources = [
     "prefs/base_prefs_export.h",
     "prefs/default_pref_store.cc",
     "prefs/default_pref_store.h",
     "prefs/json_pref_store.cc",
     "prefs/json_pref_store.h",
     "prefs/overlay_user_pref_store.cc",
@@ skipping 387 matching lines @@
     deps += [ "//third_party/libevent" ]
   }
 
   if (is_android) {
     deps += [ "//testing/android:native_test_native_code" ]
     set_sources_assignment_filter([])
     sources += [ "debug/proc_maps_linux_unittest.cc" ]
     set_sources_assignment_filter(sources_assignment_filter)
   }
 
-  if (is_win) {
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
-  }
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
 }
 
 if (is_android) {
   # GYP: //base.gyp:base_jni_headers
   generate_jni("base_jni_headers") {
     sources = [
       "android/java/src/org/chromium/base/ApplicationStatus.java",
       "android/java/src/org/chromium/base/BuildInfo.java",
       "android/java/src/org/chromium/base/CommandLine.java",
       "android/java/src/org/chromium/base/ContentUriUtils.java",
@@ skipping 85 matching lines @@
 
   # GYP: //base.gyp:base_java_unittest_support
   android_library("base_java_unittest_support") {
     deps = [
       ":base_java",
     ]
     java_files =
         [ "test/android/java/src/org/chromium/base/ContentUriTestUtils.java" ]
   }
 }