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

chrome/browser/ui/sync/one_click_signin_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_UI_SYNC_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_
 
 #include "chrome/browser/api/infobars/confirm_infobar_delegate.h"
 #include "third_party/skia/include/core/SkColor.h"
 
 // An interface derived from ConfirmInfoBarDelegate implemented for the
 // one-click sign in inforbar experiments.
 class OneClickSigninInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
   // A set of alternate colours for the experiment.  The colour values are only
   // used if |enabled| is true.  Otherwise the infobar uses its default colours.
   struct AlternateColors {
     bool enabled;
     SkColor infobar_top_color;
     SkColor infobar_bottom_color;
     SkColor button_text_color;
     SkColor button_background_color;
     SkColor button_border_color;
   };
 
-  explicit OneClickSigninInfoBarDelegate(InfoBarService* infobar_service);
   virtual ~OneClickSigninInfoBarDelegate();
 
   // Returns the colours to use with the one click signin infobar.  The colours
   // depend on the experimental group.
   virtual void GetAlternateColors(AlternateColors* alt_colors);
 
+ protected:
+  explicit OneClickSigninInfoBarDelegate(InfoBarService* infobar_service);
+
  private:
 #if defined(TOOLKIT_VIEWS)
    // Because the experiment is only running for views, only override this
    // function there.  Other platforms that support one-click sign in will
    // create a regular confirm infobar with no support for colour changes.
 
   // InfoBarDelegate:
   virtual InfoBar* CreateInfoBar(InfoBarService* owner) OVERRIDE;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_INFOBAR_DELEGATE_H_