Revert 167808 - Get rid of use of CreateStringValue in chromeos/ directory.

chrome/browser/chromeos/settings/system_settings_provider.h

Index: chrome/browser/chromeos/settings/system_settings_provider.h
===================================================================
--- chrome/browser/chromeos/settings/system_settings_provider.h	(revision 167824)
+++ chrome/browser/chromeos/settings/system_settings_provider.h	(working copy)
@@ -14,7 +14,7 @@
 #include "third_party/icu/public/i18n/unicode/timezone.h"
 
 namespace base {
-class StringValue;
+class Value;
 }
 
 namespace chromeos {
@@ -39,7 +39,7 @@
   virtual void DoSet(const std::string& path,
                      const base::Value& in_value) OVERRIDE;
 
-  scoped_ptr<base::StringValue> timezone_value_;
+  scoped_ptr<base::Value> timezone_value_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemSettingsProvider);
 };