Standardize usage of virtual/override/final specifiers.

ui/views/controls/single_split_view.h

Index: ui/views/controls/single_split_view.h
diff --git a/ui/views/controls/single_split_view.h b/ui/views/controls/single_split_view.h
index 4581e400961ff1ba02a3d808a6e5c28fe00c0743..ddd47bc590834f76eae4c8cdea8d64e73af00a86 100644
--- a/ui/views/controls/single_split_view.h
+++ b/ui/views/controls/single_split_view.h
@@ -31,17 +31,17 @@ class VIEWS_EXPORT SingleSplitView : public View {
                   Orientation orientation,
                   SingleSplitViewListener* listener);
 
-  virtual void Layout() override;
-  virtual const char* GetClassName() const override;
+  void Layout() override;
+  const char* GetClassName() const override;
 
-  virtual void GetAccessibleState(ui::AXViewState* state) override;
+  void GetAccessibleState(ui::AXViewState* state) override;
 
   // SingleSplitView's preferred size is the sum of the preferred widths
   // and the max of the heights.
-  virtual gfx::Size GetPreferredSize() const override;
+  gfx::Size GetPreferredSize() const override;
 
   // Overriden to return a resize cursor when over the divider.
-  virtual gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
+  gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
 
   Orientation orientation() const {
     return is_horizontal_ ? HORIZONTAL_SPLIT : VERTICAL_SPLIT;
@@ -81,10 +81,10 @@ class VIEWS_EXPORT SingleSplitView : public View {
 
  protected:
   // View overrides.
-  virtual bool OnMousePressed(const ui::MouseEvent& event) override;
-  virtual bool OnMouseDragged(const ui::MouseEvent& event) override;
-  virtual void OnMouseCaptureLost() override;
-  virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
+  bool OnMousePressed(const ui::MouseEvent& event) override;
+  bool OnMouseDragged(const ui::MouseEvent& event) override;
+  void OnMouseCaptureLost() override;
+  void OnBoundsChanged(const gfx::Rect& previous_bounds) override;
 
  private:
   // This test calls OnMouse* functions.