For readability.

base/i18n/number_formatting.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
 #include "base/i18n/number_formatting.h"
 
 #include "base/format_macros.h"
 #include "base/logging.h"
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/stringprintf.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "unicode/numfmt.h"
 #include "unicode/ustring.h"
 
 namespace base {
 
 namespace {
 
+// A simple wrapper around icu::NumberFormat that allows for resetting it
+// (as LazyInstance does not).
 struct NumberFormatWrapper {
   NumberFormatWrapper() {
     Reset();
   }
 
   void Reset() {
     // There's no ICU call to destroy a NumberFormat object other than
     // operator delete, so use the default Delete, which calls operator delete.
     // This can cause problems if a different allocator is used by this file
     // than by ICU.
@@ skipping 45 matching lines @@
 namespace testing {
 
 void ResetFormatters() {
   g_number_format_int.Get().Reset();
   g_number_format_float.Get().Reset();
 }
 
 }  // namespace testing
 
 }  // namespace base