Standardize usage of virtual/override/final in ui/

ui/gfx/color_analysis_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 "ui/gfx/color_analysis.h"
 
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/skia/include/core/SkBitmap.h"
@@ skipping 95 matching lines @@
 class MockKMeanImageSampler : public KMeanImageSampler {
  public:
   MockKMeanImageSampler() : current_result_index_(0) {
   }
 
   explicit MockKMeanImageSampler(const std::vector<int>& samples)
       : prebaked_sample_results_(samples),
         current_result_index_(0) {
   }
 
-  virtual ~MockKMeanImageSampler() {
-  }
+  ~MockKMeanImageSampler() override {}
 
   void AddSample(int sample) {
     prebaked_sample_results_.push_back(sample);
   }
 
-  virtual int GetSample(int width, int height) override {
+  int GetSample(int width, int height) override {
     if (current_result_index_ >= prebaked_sample_results_.size()) {
       current_result_index_ = 0;
     }
 
     if (prebaked_sample_results_.empty()) {
       return 0;
     }
 
     return prebaked_sample_results_[current_result_index_++];
   }
@@ skipping 362 matching lines @@
   Calculate8bitBitmapMinMax(result, &min_gl, &max_gl);
 
   EXPECT_EQ(0, min_gl);
   EXPECT_EQ(255, max_gl);
   EXPECT_EQ(min_gl, SkColorGetA(result.getColor(0, 0)));
   EXPECT_EQ(max_gl, SkColorGetA(result.getColor(299, 199)));
   EXPECT_EQ(93U, SkColorGetA(result.getColor(150, 0)));
 }
 
 }  // namespace color_utils