Standardize usage of virtual/override/final specifiers.

media/base/serial_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 "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/message_loop/message_loop.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/serial_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 class SerialRunnerTest : public ::testing::Test {
  public:
   SerialRunnerTest()
       : inside_start_(false), done_called_(false), done_status_(PIPELINE_OK) {}
-  virtual ~SerialRunnerTest() {}
+  ~SerialRunnerTest() override {}
 
   void RunSerialRunner() {
     message_loop_.PostTask(FROM_HERE, base::Bind(
         &SerialRunnerTest::StartRunnerInternal, base::Unretained(this),
         bound_fns_));
     message_loop_.RunUntilIdle();
   }
 
   // Pushes a bound function to the queue that will run its callback with
   // |status|. called(i) returns whether the i'th bound function pushed to the
@@ skipping 190 matching lines @@
 TEST_F(SerialRunnerTest, Closure) {
   PushClosure();
   RunSerialRunner();
 
   EXPECT_TRUE(called(0));
   EXPECT_TRUE(done_called());
   EXPECT_EQ(PIPELINE_OK, done_status());
 }
 
 }  // namespace media