Standardize usage of virtual/override/final specifiers.

components/dom_distiller/core/distiller_url_fetcher_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 "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "components/dom_distiller/core/distiller_url_fetcher.h"
 #include "net/http/http_status_code.h"
 #include "net/url_request/test_url_fetcher_factory.h"
@@ skipping 10 matching lines @@
 
 
 class DistillerURLFetcherTest : public testing::Test {
  public:
   void FetcherCallback(const std::string& response) {
      response_ = response;
   }
 
  protected:
   // testing::Test implementation:
-  virtual void SetUp() override {
+  void SetUp() override {
     url_fetcher_.reset(new dom_distiller::DistillerURLFetcher(NULL));
     factory_.reset(new net::FakeURLFetcherFactory(NULL));
     factory_->SetFakeResponse(
         GURL(kTestPageA),
         std::string(kTestPageAResponse, sizeof(kTestPageAResponse)),
         net::HTTP_OK,
         net::URLRequestStatus::SUCCESS);
     factory_->SetFakeResponse(
         GURL(kTestPageB),
         std::string(kTestPageBResponse, sizeof(kTestPageBResponse)),
@@ skipping 19 matching lines @@
 
 TEST_F(DistillerURLFetcherTest, PopulateProto) {
   Fetch(kTestPageA,
         std::string(kTestPageAResponse, sizeof(kTestPageAResponse)));
 }
 
 TEST_F(DistillerURLFetcherTest, PopulateProtoFailedFetch) {
   // Expect the callback to contain an empty string for this URL.
   Fetch(kTestPageB, std::string(std::string(), 0));
 }