Standardize usage of virtual/override/final specifiers.

ui/views/examples/double_split_view_example.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/views/examples/double_split_view_example.h"
 
 #include "ui/views/background.h"
 #include "ui/views/controls/single_split_view.h"
 #include "ui/views/layout/grid_layout.h"
 
 namespace views {
 namespace examples {
 
 namespace {
 
 // DoubleSplitViews's content, which draws gradient color on background.
 class SplittedView : public View {
  public:
   SplittedView();
-  virtual ~SplittedView();
+  ~SplittedView() override;
 
   void SetColor(SkColor from, SkColor to);
 
   // View:
-  virtual gfx::Size GetMinimumSize() const override;
+  gfx::Size GetMinimumSize() const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SplittedView);
 };
 
 SplittedView::SplittedView() {
   SetColor(SK_ColorRED, SK_ColorGREEN);
 }
 
 SplittedView::~SplittedView() {
@@ skipping 37 matching lines @@
   // Add scroll view.
   ColumnSet* column_set = layout->AddColumnSet(0);
   column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
                         GridLayout::USE_PREF, 0, 0);
   layout->StartRow(1, 0);
   layout->AddView(outer_single_split_view_);
 }
 
 }  // namespace examples
 }  // namespace views