Remove SigninDelegateObserver.

chrome/browser/ui/app_list/chrome_signin_delegate.h

 // Copyright 2013 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_APP_LIST_CHROME_SIGNIN_DELEGATE_H_
 #define CHROME_BROWSER_UI_APP_LIST_CHROME_SIGNIN_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
-#include "chrome/browser/signin/signin_tracker.h"
 #include "ui/app_list/signin_delegate.h"
 
 class Profile;
 
-class ChromeSigninDelegate : public app_list::SigninDelegate,
-                             public SigninTracker::Observer {
+class ChromeSigninDelegate : public app_list::SigninDelegate {
  public:
   explicit ChromeSigninDelegate(Profile* profile);
 
  private:
   virtual ~ChromeSigninDelegate();
 
   bool IsActiveSignin();
   void FinishSignin();
 
   // Overridden from app_list::SigninDelegate:
   virtual bool NeedSignin() OVERRIDE;
   virtual void ShowSignin() OVERRIDE;
   virtual void OpenLearnMore() OVERRIDE;
   virtual void OpenSettings() OVERRIDE;
   virtual string16 GetSigninHeading() OVERRIDE;
   virtual string16 GetSigninText() OVERRIDE;
   virtual string16 GetSigninButtonText() OVERRIDE;
   virtual string16 GetLearnMoreLinkText() OVERRIDE;
   virtual string16 GetSettingsLinkText() OVERRIDE;
 
-  // Overridden from SigninTracker::Observer:
-  virtual void SigninFailed(const GoogleServiceAuthError& error) OVERRIDE;
-  virtual void SigninSuccess() OVERRIDE;
-
   Profile* profile_;
 
-  scoped_ptr<SigninTracker> signin_tracker_;
-
   DISALLOW_COPY_AND_ASSIGN(ChromeSigninDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_APP_LIST_CHROME_SIGNIN_DELEGATE_H_