Standardize usage of virtual/override/final in cc/

cc/scheduler/begin_frame_source_unittest.cc

 // Copyright 2011 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 <deque>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "base/test/test_simple_task_runner.h"
@@ skipping 238 matching lines @@
   source.SetNeedsBeginFrames(true);
   EXPECT_TRUE(source.NeedsBeginFrames());
   source.SetNeedsBeginFrames(false);
   EXPECT_FALSE(source.NeedsBeginFrames());
 }
 
 class LoopingBeginFrameObserver : public BeginFrameObserverMixIn {
  public:
   BeginFrameSource* source_;
 
-  virtual void AsValueInto(base::debug::TracedValue* dict) const override {
+  void AsValueInto(base::debug::TracedValue* dict) const override {
     dict->SetString("type", "LoopingBeginFrameObserver");
     dict->BeginDictionary("source");
     source_->AsValueInto(dict);
     dict->EndDictionary();
   }
 
  protected:
   // BeginFrameObserverMixIn
-  virtual bool OnBeginFrameMixInDelegate(const BeginFrameArgs& args) override {
+  bool OnBeginFrameMixInDelegate(const BeginFrameArgs& args) override {
     return true;
   }
 };
 
 TEST(BeginFrameSourceMixInTest, DetectAsValueIntoLoop) {
   LoopingBeginFrameObserver obs;
   FakeBeginFrameSource source;
 
   obs.source_ = &source;
   source.AddObserver(&obs);
@@ skipping 11 matching lines @@
       base::SingleThreadTaskRunner* task_runner) {
     return make_scoped_ptr(
         new TestBackToBackBeginFrameSource(now_src, task_runner));
   }
 
  protected:
   TestBackToBackBeginFrameSource(scoped_refptr<TestNowSource> now_src,
                                  base::SingleThreadTaskRunner* task_runner)
       : BackToBackBeginFrameSource(task_runner), now_src_(now_src) {}
 
-  virtual base::TimeTicks Now() override { return now_src_->Now(); }
+  base::TimeTicks Now() override { return now_src_->Now(); }
 
   scoped_refptr<TestNowSource> now_src_;
 };
 
 class BackToBackBeginFrameSourceTest : public ::testing::Test {
  public:
   static const int64_t kDeadline;
   static const int64_t kInterval;
 
   scoped_refptr<TestNowSource> now_src_;
@@ skipping 427 matching lines @@
   mux_->SetActiveSource(source2_);
   SEND_BEGIN_FRAME_DROP(*source2_, 750, 1050, 300);
   SEND_BEGIN_FRAME_USED(*source2_, 1050, 1250, 300);
 
   mux_->SetActiveSource(source1_);
   SEND_BEGIN_FRAME_DROP(*source2_, 1100, 1400, 300);
 }
 
 }  // namespace
 }  // namespace cc