Remove null link from "welcome to tips" default suggestion. Also make some h...

chrome/browser/dom_ui/tips_handler.h

 // Copyright (c) 2009 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.
 
 // This class pulls data from a web resource (such as a JSON feed) which
 // has been stored in the user's preferences file.  Used mainly
 // by the suggestions and tips area of the new tab page.
 
 // Current sketch of tip cache format, hardcoded for popgadget data in
 // basic text form:
@@ skipping 13 matching lines @@
 class DictionaryValue;
 class DOMUI;
 class PrefService;
 class Value;
 
 class TipsHandler : public DOMMessageHandler {
  public:
   TipsHandler() : tips_cache_(NULL) {}
   virtual ~TipsHandler() {}
 
-  // DOMMessageHandler implementation and overrides. 
-  virtual DOMMessageHandler* Attach(DOMUI* dom_ui); 
+  // DOMMessageHandler implementation and overrides.
+  virtual DOMMessageHandler* Attach(DOMUI* dom_ui);
   virtual void RegisterMessages();
 
   // Callback which pulls tips data from the preferences.
   void HandleGetTips(const Value* content);
 
   // Register tips cache with pref service.
   static void RegisterUserPrefs(PrefService* prefs);
 
  private:
   // Make sure the string we are pushing to the NTP is a valid URL.
   bool IsValidURL(const std::wstring& url_string);
 
+  // So we can push data out to the page that has called this handler.
+  DOMUI* dom_ui_;
+
   // Filled with data from cache in preferences.
   const DictionaryValue* tips_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(TipsHandler);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_TIPS_HANDLER_H_