Revert "Fix a ton of compiler warnings."

base/task.h

-// 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 BASE_TASK_H_
 #define BASE_TASK_H_
 
 #include "base/non_thread_safe.h"
 #include "base/revocable_store.h"
 #include "base/tracked.h"
 #include "base/tuple.h"
@@ skipping 659 matching lines @@
  private:
   Method m_;
   Params p_;
 };
 
 // Return value implementation with no args.
 template <typename ReturnValue>
 struct CallbackWithReturnValue {
   class Type {
    public:
-    virtual ~Type() {}
     virtual ReturnValue Run() = 0;
   };
 };
 
 template <class T, typename Method, typename ReturnValue>
 class CallbackWithReturnValueImpl
     : public CallbackStorage<T, Method>,
       public CallbackWithReturnValue<ReturnValue>::Type {
  public:
   CallbackWithReturnValueImpl(T* obj, Method meth)
       : CallbackStorage<T, Method>(obj, meth) {}
 
   virtual ReturnValue Run() {
     return (this->obj_->*(this->meth_))();
   }
-
- protected:
-  ~CallbackWithReturnValueImpl() {}
 };
 
 template <class T, typename ReturnValue>
 typename CallbackWithReturnValue<ReturnValue>::Type*
 NewCallbackWithReturnValue(T* object, ReturnValue (T::*method)()) {
   return new CallbackWithReturnValueImpl<T, ReturnValue (T::*)(), ReturnValue>(
       object, method);
 }
 
 
 #endif  // BASE_TASK_H_