Standardize usage of virtual/override/final specifiers.

ui/views/layout/grid_layout.h

Index: ui/views/layout/grid_layout.h
diff --git a/ui/views/layout/grid_layout.h b/ui/views/layout/grid_layout.h
index ad228d5ce4a7ce8598ca13a341c4367d5faa71e7..20084c00e0ced755daa88cbf834d9a50f69ddfb4 100644
--- a/ui/views/layout/grid_layout.h
+++ b/ui/views/layout/grid_layout.h
@@ -100,7 +100,7 @@ class VIEWS_EXPORT GridLayout : public LayoutManager {
   };
 
   explicit GridLayout(View* host);
-  virtual ~GridLayout();
+  ~GridLayout() override;
 
   // Creates a GridLayout with kPanel*Margin insets.
   static GridLayout* CreatePanel(View* host);
@@ -162,26 +162,25 @@ class VIEWS_EXPORT GridLayout : public LayoutManager {
 
   // Notification we've been installed on a particular host. Checks that host
   // is the same as the View supplied in the constructor.
-  virtual void Installed(View* host) override;
+  void Installed(View* host) override;
 
   // Notification we've been uninstalled on a particular host. Checks that host
   // is the same as the View supplied in the constructor.
-  virtual void Uninstalled(View* host) override;
+  void Uninstalled(View* host) override;
 
   // Notification that a view has been added.
-  virtual void ViewAdded(View* host, View* view) override;
+  void ViewAdded(View* host, View* view) override;
 
   // Notification that a view has been removed.
-  virtual void ViewRemoved(View* host, View* view) override;
+  void ViewRemoved(View* host, View* view) override;
 
   // Layouts out the components.
-  virtual void Layout(View* host) override;
+  void Layout(View* host) override;
 
   // Returns the preferred size for the GridLayout.
-  virtual gfx::Size GetPreferredSize(const View* host) const override;
+  gfx::Size GetPreferredSize(const View* host) const override;
 
-  virtual int GetPreferredHeightForWidth(const View* host,
-                                         int width) const override;
+  int GetPreferredHeightForWidth(const View* host, int width) const override;
 
   void set_minimum_size(const gfx::Size& size) { minimum_size_ = size; }