Standardize usage of virtual/override/final specifiers.

components/dom_distiller/core/distiller_unittest.cc

 // Copyright 2013 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 <algorithm>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 245 matching lines @@
 class MockDistillerURLFetcherFactory : public DistillerURLFetcherFactory {
  public:
   MockDistillerURLFetcherFactory() : DistillerURLFetcherFactory(NULL) {}
   virtual ~MockDistillerURLFetcherFactory() {}
 
   MOCK_CONST_METHOD0(CreateDistillerURLFetcher, DistillerURLFetcher*());
 };
 
 class DistillerTest : public testing::Test {
  public:
-  virtual ~DistillerTest() {}
+  ~DistillerTest() override {}
 
   void OnDistillArticleDone(scoped_ptr<DistilledArticleProto> proto) {
     article_proto_ = proto.Pass();
   }
 
   void OnDistillArticleUpdate(const ArticleDistillationUpdate& article_update) {
     in_sequence_updates_.push_back(article_update);
   }
 
   void DistillPage(const std::string& url,
@@ skipping 368 matching lines @@
 
   ASSERT_TRUE(distiller_page);
   // Post the task to execute javascript and then delete the distiller.
   distiller_page->OnDistillationDone(GURL(kURL), distilled_value.get());
   distiller_.reset();
 
   base::MessageLoop::current()->RunUntilIdle();
 }
 
 }  // namespace dom_distiller