Standardize usage of virtual/override/final in ui/

ui/gfx/render_text_mac.h

Index: ui/gfx/render_text_mac.h
diff --git a/ui/gfx/render_text_mac.h b/ui/gfx/render_text_mac.h
index f69bedb6067941a415a8c0e0feda5afa89f036f1..247bd53c038eef0c7438d4e4137c30ca360c069b 100644
--- a/ui/gfx/render_text_mac.h
+++ b/ui/gfx/render_text_mac.h
@@ -23,31 +23,31 @@ namespace gfx {
 class RenderTextMac : public RenderText {
  public:
   RenderTextMac();
-  virtual ~RenderTextMac();
+  ~RenderTextMac() override;
 
   // Overridden from RenderText:
-  virtual Size GetStringSize() override;
-  virtual SizeF GetStringSizeF() override;
-  virtual SelectionModel FindCursorPosition(const Point& point) override;
-  virtual std::vector<FontSpan> GetFontSpansForTesting() override;
+  Size GetStringSize() override;
+  SizeF GetStringSizeF() override;
+  SelectionModel FindCursorPosition(const Point& point) override;
+  std::vector<FontSpan> GetFontSpansForTesting() override;
 
  protected:
   // Overridden from RenderText:
-  virtual int GetLayoutTextBaseline() override;
-  virtual SelectionModel AdjacentCharSelectionModel(
+  int GetLayoutTextBaseline() override;
+  SelectionModel AdjacentCharSelectionModel(
       const SelectionModel& selection,
       VisualCursorDirection direction) override;
-  virtual SelectionModel AdjacentWordSelectionModel(
+  SelectionModel AdjacentWordSelectionModel(
       const SelectionModel& selection,
       VisualCursorDirection direction) override;
-  virtual Range GetGlyphBounds(size_t index) override;
-  virtual std::vector<Rect> GetSubstringBounds(const Range& range) override;
-  virtual size_t TextIndexToLayoutIndex(size_t index) const override;
-  virtual size_t LayoutIndexToTextIndex(size_t index) const override;
-  virtual bool IsValidCursorIndex(size_t index) override;
-  virtual void ResetLayout() override;
-  virtual void EnsureLayout() override;
-  virtual void DrawVisualText(Canvas* canvas) override;
+  Range GetGlyphBounds(size_t index) override;
+  std::vector<Rect> GetSubstringBounds(const Range& range) override;
+  size_t TextIndexToLayoutIndex(size_t index) const override;
+  size_t LayoutIndexToTextIndex(size_t index) const override;
+  bool IsValidCursorIndex(size_t index) override;
+  void ResetLayout() override;
+  void EnsureLayout() override;
+  void DrawVisualText(Canvas* canvas) override;
 
  private:
   struct TextRun {