Revert "Fix a ton of compiler warnings."

chrome/browser/history/history_types.h

Index: chrome/browser/history/history_types.h
diff --git a/chrome/browser/history/history_types.h b/chrome/browser/history/history_types.h
index 9a7f36d5190b5886f178281eba4e2c02665a7d79..c96737406fef1f197af4eafc5ead0fe372078301 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -1,9 +1,9 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2008 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_HISTORY_HISTORY_TYPES_H_
-#define CHROME_BROWSER_HISTORY_HISTORY_TYPES_H_
+#ifndef CHROME_BROWSER_HISTORY_HISTORY_TYPES_H__
+#define CHROME_BROWSER_HISTORY_HISTORY_TYPES_H__
 
 #include <map>
 #include <set>
@@ -73,7 +73,6 @@ class URLRow {
     // Initialize will not set the URL, so our initialization above will stay.
     Initialize();
   }
-  virtual ~URLRow() {}
 
   URLID id() const { return id_; }
   const GURL& url() const { return url_; }
@@ -521,4 +520,4 @@ struct KeywordSearchTermVisit {
 
 }  // history
 
-#endif  // CHROME_BROWSER_HISTORY_HISTORY_TYPES_H_
+#endif  // CHROME_BROWSER_HISTORY_HISTORY_TYPES_H__