Revert "Fix a ton of compiler warnings."

base/task.h

Index: base/task.h
diff --git a/base/task.h b/base/task.h
index 2b3b51c7026498db6374626dcec6e558d2d8de37..447bfabe6c59b5ad9ead6d91d1ee762381d577ba 100644
--- a/base/task.h
+++ b/base/task.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -678,7 +678,6 @@ template <typename ReturnValue>
 struct CallbackWithReturnValue {
   class Type {
    public:
-    virtual ~Type() {}
     virtual ReturnValue Run() = 0;
   };
 };
@@ -694,9 +693,6 @@ class CallbackWithReturnValueImpl
   virtual ReturnValue Run() {
     return (this->obj_->*(this->meth_))();
   }
-
- protected:
-  ~CallbackWithReturnValueImpl() {}
 };
 
 template <class T, typename ReturnValue>