Standardize usage of virtual/override/final specifiers.

components/dom_distiller/core/task_tracker_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 "components/dom_distiller/core/task_tracker.h"
 
 #include "base/run_loop.h"
 #include "components/dom_distiller/core/article_distillation_update.h"
 #include "components/dom_distiller/core/article_entry.h"
 #include "components/dom_distiller/core/distilled_content_store.h"
@@ skipping 39 matching lines @@
 };
 
 class MockSaveCallback {
  public:
   MOCK_METHOD3(Save,
                void(const ArticleEntry&, const DistilledArticleProto*, bool));
 };
 
 class DomDistillerTaskTrackerTest : public testing::Test {
  public:
-  virtual void SetUp() override {
+  void SetUp() override {
     message_loop_.reset(new base::MessageLoop());
     entry_id_ = "id0";
     page_0_url_ = GURL("http://www.example.com/1");
     page_1_url_ = GURL("http://www.example.com/2");
   }
 
   ArticleEntry GetDefaultEntry() {
     ArticleEntry entry;
     entry.set_entry_id(entry_id_);
     ArticleEntryPage* page0 = entry.add_pages();
@@ skipping 323 matching lines @@
       new DistilledArticleProto(distilled_article)));
   base::RunLoop().RunUntilIdle();
 
   ASSERT_EQ(stored_distilled_article.SerializeAsString(),
             distilled_article.SerializeAsString());
   EXPECT_FALSE(cancel_callback.Cancelled());
 }
 
 }  // namespace test
 }  // namespace dom_distiller