Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/google/google_url_tracker_infobar_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_INFOBAR_DELEGATE_H_
 
 #include "chrome/browser/api/infobars/confirm_infobar_delegate.h"
 #include "googleurl/src/gurl.h"
 
 class GoogleURLTracker;
 
 // This infobar is shown by the GoogleURLTracker when the Google base URL has
 // changed.
 class GoogleURLTrackerInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
-  GoogleURLTrackerInfoBarDelegate(InfoBarService* infobar_service,
-                                  GoogleURLTracker* google_url_tracker,
-                                  const GURL& search_url);
+  // Creates a Google URL tracker delegate and adds it to |infobar_service|.
+  // Returns the delegate if it was successfully added.
+  static GoogleURLTrackerInfoBarDelegate* Create(
+      InfoBarService* infobar_service,
+      GoogleURLTracker* google_url_tracker,
+      const GURL& search_url);
 
   // ConfirmInfoBarDelegate:
   virtual bool Accept() OVERRIDE;
   virtual bool Cancel() OVERRIDE;
   virtual string16 GetLinkText() const OVERRIDE;
   virtual bool LinkClicked(WindowOpenDisposition disposition) OVERRIDE;
   virtual bool ShouldExpireInternal(
       const content::LoadCommittedDetails& details) const OVERRIDE;
 
   // Other than set_pending_id(), these accessors are only used by test code.
   const GURL& search_url() const { return search_url_; }
   void set_search_url(const GURL& search_url) { search_url_ = search_url; }
   int pending_id() const { return pending_id_; }
   void set_pending_id(int pending_id) { pending_id_ = pending_id; }
 
   // These are virtual so test code can override them in a subclass.
   virtual void Update(const GURL& search_url);
   virtual void Close(bool redo_search);
 
  protected:
+  GoogleURLTrackerInfoBarDelegate(InfoBarService* infobar_service,
+                                  GoogleURLTracker* google_url_tracker,
+                                  const GURL& search_url);
   virtual ~GoogleURLTrackerInfoBarDelegate();
 
  private:
   // ConfirmInfoBarDelegate:
   virtual string16 GetMessageText() const OVERRIDE;
   virtual string16 GetButtonLabel(InfoBarButton button) const OVERRIDE;
 
   GoogleURLTracker* google_url_tracker_;
   GURL search_url_;
   int pending_id_;
 
   DISALLOW_COPY_AND_ASSIGN(GoogleURLTrackerInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_INFOBAR_DELEGATE_H_