Standardize usage of virtual/override/final specifiers.

media/base/pipeline_unittest.cc

 // Copyright (c) 2012 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 <vector>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/stl_util.h"
 #include "base/test/simple_test_tick_clock.h"
@@ skipping 760 matching lines @@
     kPlaying,
   };
 
   enum StopOrError {
     kStop,
     kError,
     kErrorAndStop,
   };
 
   PipelineTeardownTest() {}
-  virtual ~PipelineTeardownTest() {}
+  ~PipelineTeardownTest() override {}
 
   void RunTest(TeardownState state, StopOrError stop_or_error) {
     switch (state) {
       case kInitDemuxer:
       case kInitRenderer:
         DoInitialize(state, stop_or_error);
         break;
 
       case kFlushing:
       case kSeeking:
@@ skipping 201 matching lines @@
 
 INSTANTIATE_TEARDOWN_TEST(Error, InitDemuxer);
 INSTANTIATE_TEARDOWN_TEST(Error, InitRenderer);
 INSTANTIATE_TEARDOWN_TEST(Error, Flushing);
 INSTANTIATE_TEARDOWN_TEST(Error, Seeking);
 INSTANTIATE_TEARDOWN_TEST(Error, Playing);
 
 INSTANTIATE_TEARDOWN_TEST(ErrorAndStop, Playing);
 
 }  // namespace media