Revert "Fix a ton of compiler warnings."

chrome/browser/login_model.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.
 
 #ifndef CHROME_BROWSER_LOGIN_MODEL_H_
 #define CHROME_BROWSER_LOGIN_MODEL_H_
 
 #include <string>
 
 // Simple Model & Observer interfaces for a LoginView to facilitate exchanging
 // information.
 class LoginModelObserver {
  public:
   // Called by the model when a username,password pair has been identified
   // as a match for the pending login prompt.
   virtual void OnAutofillDataAvailable(const std::wstring& username,
                                        const std::wstring& password) = 0;
- protected:
-  ~LoginModelObserver() {}
 };
 
 class LoginModel {
  public:
   // Set the observer interested in the data from the model.
   // observer can be null, signifying there is no longer any observer
   // interested in the data.
   virtual void SetObserver(LoginModelObserver* observer) = 0;
- protected:
-  ~LoginModel() {}
 };
 
 #endif  // CHROME_BROWSER_LOGIN_MODEL_H_