Virtual destructors should have virtual keyword.

chrome/browser/extensions/extension_debugger_api.h

Index: chrome/browser/extensions/extension_debugger_api.h
diff --git a/chrome/browser/extensions/extension_debugger_api.h b/chrome/browser/extensions/extension_debugger_api.h
index 0974b1c25c21f7ec7944f25b7a0074c30b367376..5fd9d008cc3cc79b8497f7b8e5d2bf17a328a43a 100644
--- a/chrome/browser/extensions/extension_debugger_api.h
+++ b/chrome/browser/extensions/extension_debugger_api.h
@@ -34,7 +34,7 @@ class DebuggerFunction : public AsyncExtensionFunction {
 class AttachDebuggerFunction : public DebuggerFunction {
  public:
   AttachDebuggerFunction();
-  ~AttachDebuggerFunction();
+  virtual ~AttachDebuggerFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.attach")
 };
@@ -43,7 +43,7 @@ class AttachDebuggerFunction : public DebuggerFunction {
 class DetachDebuggerFunction : public DebuggerFunction {
  public:
   DetachDebuggerFunction();
-  ~DetachDebuggerFunction();
+  virtual ~DetachDebuggerFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("experimental.debugger.detach")
 };
@@ -52,7 +52,7 @@ class DetachDebuggerFunction : public DebuggerFunction {
 class SendRequestDebuggerFunction : public DebuggerFunction {
  public:
   SendRequestDebuggerFunction();
-  ~SendRequestDebuggerFunction();
+  virtual ~SendRequestDebuggerFunction();
   virtual bool RunImpl();
 
   void SendResponseBody(DictionaryValue* dictionary);