Standardize usage of virtual/override/final in ui/

ui/gl/gl_image_memory.h

Index: ui/gl/gl_image_memory.h
diff --git a/ui/gl/gl_image_memory.h b/ui/gl/gl_image_memory.h
index 2d6b93e245d83998dd3577bd66f197bb6b78605d..fd659e76e58b221b91dcddff360ae6fe8a377723 100644
--- a/ui/gl/gl_image_memory.h
+++ b/ui/gl/gl_image_memory.h
@@ -27,23 +27,23 @@ class GL_EXPORT GLImageMemory : public GLImage {
                   gfx::GpuMemoryBuffer::Format format);
 
   // Overridden from GLImage:
-  virtual void Destroy(bool have_context) override;
-  virtual gfx::Size GetSize() override;
-  virtual bool BindTexImage(unsigned target) override;
-  virtual void ReleaseTexImage(unsigned target) override {}
-  virtual bool CopyTexImage(unsigned target) override;
-  virtual void WillUseTexImage() override;
-  virtual void DidUseTexImage() override;
-  virtual void WillModifyTexImage() override {}
-  virtual void DidModifyTexImage() override {}
-  virtual bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
-                                    int z_order,
-                                    OverlayTransform transform,
-                                    const Rect& bounds_rect,
-                                    const RectF& crop_rect) override;
+  void Destroy(bool have_context) override;
+  gfx::Size GetSize() override;
+  bool BindTexImage(unsigned target) override;
+  void ReleaseTexImage(unsigned target) override {}
+  bool CopyTexImage(unsigned target) override;
+  void WillUseTexImage() override;
+  void DidUseTexImage() override;
+  void WillModifyTexImage() override {}
+  void DidModifyTexImage() override {}
+  bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
+                            int z_order,
+                            OverlayTransform transform,
+                            const Rect& bounds_rect,
+                            const RectF& crop_rect) override;
 
  protected:
-  virtual ~GLImageMemory();
+  ~GLImageMemory() override;
 
  private:
   void DoBindTexImage(unsigned target);