Convert TimeFormat (chrome/common/time_format.*) to string16 (from wstring).

chrome/common/time_format.h

Index: chrome/common/time_format.h
diff --git a/chrome/common/time_format.h b/chrome/common/time_format.h
index 6045cef427d1047776ac0acf70e97ea61e60ec29..86c80b2867713e285b0cc89735b3dfea62132f63 100644
--- a/chrome/common/time_format.h
+++ b/chrome/common/time_format.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
@@ -8,7 +8,7 @@
 
 // This file defines methods to format time values as strings.
 
-#include <string>
+#include "base/string16.h"
 
 #include "unicode/smpdtfmt.h"
 
@@ -25,13 +25,13 @@ class TimeFormat {
   // in-progress operations and users have different expectations of units.
 
   // Returns times in elapsed-format: "3 mins ago", "2 days ago".
-  static std::wstring TimeElapsed(const base::TimeDelta& delta);
+  static string16 TimeElapsed(const base::TimeDelta& delta);
 
   // Returns times in remaining-format: "3 mins left", "2 days left".
-  static std::wstring TimeRemaining(const base::TimeDelta& delta);
+  static string16 TimeRemaining(const base::TimeDelta& delta);
 
   // Returns times in short-format: "3 mins", "2 days".
-  static std::wstring TimeRemainingShort(const base::TimeDelta& delta);
+  static string16 TimeRemainingShort(const base::TimeDelta& delta);
 
   // For displaying a relative time in the past.  This method returns either
   // "Today", "Yesterday", or an empty string if it's older than that.
@@ -46,8 +46,8 @@ class TimeFormat {
   // If NULL, the current day's midnight will be retrieved, which can be
   // slow. If many items are being processed, it is best to get the current
   // time once at the beginning and pass it for each computation.
-  static std::wstring RelativeDate(const base::Time& time,
-                                   const base::Time* optional_midnight_today);
+  static string16 RelativeDate(const base::Time& time,
+                               const base::Time* optional_midnight_today);
 };
 
 #endif  // CHROME_COMMON_TIME_FORMAT_H__