Remove SigninDelegateObserver.

chrome/browser/ui/app_list/chrome_signin_delegate.h

Index: chrome/browser/ui/app_list/chrome_signin_delegate.h
diff --git a/chrome/browser/ui/app_list/chrome_signin_delegate.h b/chrome/browser/ui/app_list/chrome_signin_delegate.h
index 059cbdc4513995e572992ac087e60c04ae8610be..17e9b5a363267379cd5ac641a58f892a30df7176 100644
--- a/chrome/browser/ui/app_list/chrome_signin_delegate.h
+++ b/chrome/browser/ui/app_list/chrome_signin_delegate.h
@@ -7,13 +7,11 @@
 
 #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);
 
@@ -34,14 +32,8 @@ class ChromeSigninDelegate : public app_list::SigninDelegate,
   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);
 };