Refactor the about:version code out of about_ui.

chrome/browser/ui/webui/chrome_web_ui_data_source.h

Index: chrome/browser/ui/webui/chrome_web_ui_data_source.h
===================================================================
--- chrome/browser/ui/webui/chrome_web_ui_data_source.h	(revision 158638)
+++ chrome/browser/ui/webui/chrome_web_ui_data_source.h	(working copy)
@@ -21,10 +21,14 @@
   explicit ChromeWebUIDataSource(const std::string& source_name);
   ChromeWebUIDataSource(const std::string& source_name, MessageLoop* loop);
 
-  // Adds a string and its equivalent to our dictionary.
+  // Adds a string keyed to its name to our dictionary.
   void AddString(const std::string& name, const string16& value);
 
-  // Adds a name and its equivaled localized string to our dictionary.
+  // Adds a string keyed to its name to our dictionary.
+  void AddString(const std::string& name, const std::string& value);
+
+  // Adds a localized string with resource |ids| keyed to its name to our
+  // dictionary.
   void AddLocalizedString(const std::string& name, int ids);
 
   // Add strings from |localized_strings| to our dictionary.