Revert "Fix a ton of compiler warnings."

chrome/browser/login_model.h

Index: chrome/browser/login_model.h
diff --git a/chrome/browser/login_model.h b/chrome/browser/login_model.h
index 6d764bec9672f2e4fe2c0a37648c19b24f965331..cbd2fef2e0e2451e11dbca5ad6063fed7eb7c334 100644
--- a/chrome/browser/login_model.h
+++ b/chrome/browser/login_model.h
@@ -15,8 +15,6 @@ class LoginModelObserver {
   // as a match for the pending login prompt.
   virtual void OnAutofillDataAvailable(const std::wstring& username,
                                        const std::wstring& password) = 0;
- protected:
-  ~LoginModelObserver() {}
 };
 
 class LoginModel {
@@ -25,8 +23,6 @@ class LoginModel {
   // 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_