Standardize usage of virtual/override/final specifiers.

content/browser/startup_task_runner_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 "content/browser/startup_task_runner.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 24 matching lines @@
   return true;
 }
 
 void Observer(int result) {
   observer_calls++;
   observer_result = result;
 }
 
 class StartupTaskRunnerTest : public testing::Test {
  public:
-
-  virtual void SetUp() {
+  void SetUp() override {
     last_task_ = 0;
     observer_calls = 0;
     task_count = 0;
   }
 
   int Task1() {
     last_task_ = 1;
     task_count++;
     return 0;
   }
@@ skipping 254 matching lines @@
   EXPECT_EQ(observer_calls, 1);
   EXPECT_EQ(observer_result, 1);
 
   // Check that running synchronously now doesn't do anything
   runner.RunAllTasksNow();
   EXPECT_EQ(observer_calls, 1);
   EXPECT_EQ(task_count, 1);
 }
 }  // namespace
 }  // namespace content