Revert "win: /utf-8 for all code"

build/config/compiler/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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 825 matching lines @@
 config("default_warnings") {
   cflags = []
   cflags_cc = []
 
   if (is_win) {
     if (treat_warnings_as_errors) {
       cflags += [ "/WX" ]
     }
 
     cflags += [
-      # Assume UTF-8 by default to avoid code page dependencies.
-      "/utf-8",
-    ]
-
-    cflags += [
       # Warnings permanently disabled:
 
       # C4091: 'typedef ': ignored on left of 'X' when no variable is
       #                    declared.
       # This happens in a number of Windows headers. Dumb.
       "/wd4091",
 
       # C4127: conditional expression is constant
       # This warning can in theory catch dead code and other problems, but
       # triggers in far too many desirable cases where the conditional
@@ skipping 210 matching lines @@
 }
 
 # chromium_code ---------------------------------------------------------------
 #
 # Toggles between higher and lower warnings for code that is (or isn't)
 # part of Chromium.
 
 config("chromium_code") {
   if (is_win) {
     cflags = [ "/W4" ]  # Warning level 4.
+
+    # Assume UTF-8 by default to avoid code page dependencies.
+    cflags += [ "/utf-8" ]
   } else {
     cflags = [ "-Wall" ]
     if (treat_warnings_as_errors) {
       cflags += [ "-Werror" ]
 
       # The compiler driver can sometimes (rarely) emit warnings before calling
       # the actual linker.  Make sure these warnings are treated as errors as
       # well.
       ldflags = [ "-Werror" ]
     }
@@ skipping 552 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }