Add virtual and OVERRIDE to base/ implementation files

base/values_unittest.cc

 // 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.
 
 #include <limits>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/string16.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
@@ skipping 157 matching lines @@
   explicit DeletionTestValue(bool* deletion_flag) : Value(TYPE_NULL) {
     Init(deletion_flag);  // Separate function so that we can use ASSERT_*
   }
 
   void Init(bool* deletion_flag) {
     ASSERT_TRUE(deletion_flag);
     deletion_flag_ = deletion_flag;
     *deletion_flag_ = false;
   }
 
-  ~DeletionTestValue() {
+  virtual ~DeletionTestValue() {
     *deletion_flag_ = true;
   }
 
  private:
   bool* deletion_flag_;
 };
 
 TEST(ValuesTest, ListDeletion) {
   bool deletion_flag = true;
 
@@ skipping 560 matching lines @@
       seen2 = true;
     } else {
       ADD_FAILURE();
     }
   }
   EXPECT_TRUE(seen1);
   EXPECT_TRUE(seen2);
 }
 
 }  // namespace base