Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/ui/views/color_chooser_win.cc

Index: chrome/browser/ui/views/color_chooser_win.cc
diff --git a/chrome/browser/ui/views/color_chooser_win.cc b/chrome/browser/ui/views/color_chooser_win.cc
index ce4ee36d36fe0e702682f3c52cc6d41a6de52d2e..8d44da4c2ad419f15f15b45c664f154c88c0537d 100644
--- a/chrome/browser/ui/views/color_chooser_win.cc
+++ b/chrome/browser/ui/views/color_chooser_win.cc
@@ -23,15 +23,15 @@ class ColorChooserWin : public content::ColorChooser,
 
   ColorChooserWin(content::WebContents* web_contents,
                   SkColor initial_color);
-  ~ColorChooserWin();
+  ~ColorChooserWin() override;
 
   // content::ColorChooser overrides:
-  virtual void End() override;
-  virtual void SetSelectedColor(SkColor color) override {}
+  void End() override;
+  void SetSelectedColor(SkColor color) override {}
 
   // views::ColorChooserListener overrides:
-  virtual void OnColorChosen(SkColor color);
-  virtual void OnColorChooserDialogClosed();
+  void OnColorChosen(SkColor color) override;
+  void OnColorChooserDialogClosed() override;
 
  private:
   static ColorChooserWin* current_color_chooser_;