Standardize usage of virtual/override/final in cc/

cc/layers/layer_perftest.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 "cc/layers/layer.h"
 
 #include "cc/debug/lap_timer.h"
 #include "cc/resources/layer_painter.h"
 #include "cc/test/fake_impl_proxy.h"
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/fake_layer_tree_host_impl.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/perf/perf_test.h"
 
 namespace cc {
 namespace {
 
 static const int kTimeLimitMillis = 3000;
 static const int kWarmupRuns = 5;
 static const int kTimeCheckInterval = 10;
 
 class MockLayerPainter : public LayerPainter {
  public:
-  virtual void Paint(SkCanvas* canvas, const gfx::Rect& content_rect) override {
-  }
+  void Paint(SkCanvas* canvas, const gfx::Rect& content_rect) override {}
 };
 
 
 class LayerPerfTest : public testing::Test {
  public:
   LayerPerfTest()
       : host_impl_(&proxy_, &shared_bitmap_manager_),
         fake_client_(FakeLayerTreeHostClient::DIRECT_3D),
         timer_(kWarmupRuns,
                base::TimeDelta::FromMilliseconds(kTimeLimitMillis),
@@ skipping 75 matching lines @@
                          "",
                          "props_didnt_change",
                          timer_.LapsPerSecond(),
                          "runs/s",
                          true);
 }
 
 
 }  // namespace
 }  // namespace cc