Virtual destructors should have virtual keyword.

chrome/browser/extensions/extension_debugger_api.h

 // Copyright (c) 2011 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.
 
 // Defines the Chrome Extensions Debugger API functions for attaching debugger
 // to the page.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_
 #pragma once
@@ skipping 16 matching lines @@
   bool InitClientHost(int tab_id);
 
   TabContents* contents_;
   ExtensionDevToolsClientHost* client_host_;
 };
 
 // Implements the debugger.attach() extension function.
 class AttachDebuggerFunction : public DebuggerFunction {
  public:
   AttachDebuggerFunction();
-  ~AttachDebuggerFunction();
+  virtual ~AttachDebuggerFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.attach")
 };
 
 // Implements the debugger.detach() extension function.
 class DetachDebuggerFunction : public DebuggerFunction {
  public:
   DetachDebuggerFunction();
-  ~DetachDebuggerFunction();
+  virtual ~DetachDebuggerFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.detach")
 };
 
 // Implements the debugger.sendRequest() extension function.
 class SendRequestDebuggerFunction : public DebuggerFunction {
  public:
   SendRequestDebuggerFunction();
-  ~SendRequestDebuggerFunction();
+  virtual ~SendRequestDebuggerFunction();
   virtual bool RunImpl();
 
   void SendResponseBody(DictionaryValue* dictionary);
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.sendRequest")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DEBUGGER_API_H_