Standardize usage of virtual/override/final specifiers.

content/browser/media/capture/video_capture_oracle_unittest.cc

 // Copyright (c) 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/media/capture/video_capture_oracle.h"
 
 #include <cstdlib>
 #include <utility>
 #include <vector>
 
@@ skipping 479 matching lines @@
     { true, 33.441 }, { false, 16.72 }, { true, 16.72 }, { true, 50.16 }
   };
 
   SmoothEventSampler sampler(base::TimeDelta::FromSeconds(1) / 30, true, 3);
   ReplayCheckingSamplerDecisions(data_points, arraysize(data_points), &sampler);
 }
 
 class AnimatedContentSamplerTest : public ::testing::Test {
  public:
   AnimatedContentSamplerTest() {}
-  virtual ~AnimatedContentSamplerTest() {}
+  ~AnimatedContentSamplerTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     const base::TimeDelta since_epoch =
         InitialTestTimeTicks() - base::TimeTicks::UnixEpoch();
     rand_seed_ = abs(static_cast<int>(since_epoch.InMicroseconds()));
     sampler_.reset(new AnimatedContentSampler(GetMinCapturePeriod()));
   }
 
  protected:
   // Overridden by subclass for parameterized tests.
   virtual base::TimeDelta GetMinCapturePeriod() const {
     return base::TimeDelta::FromSeconds(1) / 30;
@@ skipping 739 matching lines @@
       // |event_increment|.
       const base::TimeDelta max_acceptable_delta = (i % 100) == 78 ?
           event_increment * 5 : event_increment * 2;
       EXPECT_GE(max_acceptable_delta.InMicroseconds(), delta.InMicroseconds());
     }
     last_frame_timestamp = frame_timestamp;
   }
 }
 
 }  // namespace content