Standardize usage of virtual/override/final in ui/

ui/base/default_theme_provider.h

Index: ui/base/default_theme_provider.h
diff --git a/ui/base/default_theme_provider.h b/ui/base/default_theme_provider.h
index 0fe64d117fda10db973755f185a81dd888efad68..173442deaa246cd58a08a14aa6ee332b342d89c6 100644
--- a/ui/base/default_theme_provider.h
+++ b/ui/base/default_theme_provider.h
@@ -21,25 +21,24 @@ namespace ui {
 class UI_BASE_EXPORT DefaultThemeProvider : public ThemeProvider {
  public:
   DefaultThemeProvider();
-  virtual ~DefaultThemeProvider();
+  ~DefaultThemeProvider() override;
 
   // Overridden from ui::ThemeProvider:
-  virtual bool UsingSystemTheme() const override;
-  virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const override;
-  virtual SkColor GetColor(int id) const override;
-  virtual int GetDisplayProperty(int id) const override;
-  virtual bool ShouldUseNativeFrame() const override;
-  virtual bool HasCustomImage(int id) const override;
-  virtual base::RefCountedMemory* GetRawData(
-      int id,
-      ui::ScaleFactor scale_factor) const override;
+  bool UsingSystemTheme() const override;
+  gfx::ImageSkia* GetImageSkiaNamed(int id) const override;
+  SkColor GetColor(int id) const override;
+  int GetDisplayProperty(int id) const override;
+  bool ShouldUseNativeFrame() const override;
+  bool HasCustomImage(int id) const override;
+  base::RefCountedMemory* GetRawData(int id, ui::ScaleFactor scale_factor)
+      const override;
 
 #if defined(OS_MACOSX)
-  virtual NSImage* GetNSImageNamed(int id) const override;
-  virtual NSColor* GetNSImageColorNamed(int id) const override;
-  virtual NSColor* GetNSColor(int id) const override;
-  virtual NSColor* GetNSColorTint(int id) const override;
-  virtual NSGradient* GetNSGradient(int id) const override;
+  NSImage* GetNSImageNamed(int id) const override;
+  NSColor* GetNSImageColorNamed(int id) const override;
+  NSColor* GetNSColor(int id) const override;
+  NSColor* GetNSColorTint(int id) const override;
+  NSGradient* GetNSGradient(int id) const override;
 #endif
 
  private: