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

ui/chromeos/network/network_icon.cc

Index: ui/chromeos/network/network_icon.cc
diff --git a/ui/chromeos/network/network_icon.cc b/ui/chromeos/network/network_icon.cc
index d41550aff6baa43a4ff26d66a3ffd926cfdf400d..a64c711c711c2ec9e1f473ce9eec946a829c69ed 100644
--- a/ui/chromeos/network/network_icon.cc
+++ b/ui/chromeos/network/network_icon.cc
@@ -214,7 +214,7 @@ class EmptyImageSource: public gfx::ImageSkiaSource {
       : size_(size) {
   }
 
-  virtual gfx::ImageSkiaRep GetImageForScale(float scale) override {
+  gfx::ImageSkiaRep GetImageForScale(float scale) override {
     gfx::Size pixel_size = gfx::ToFlooredSize(gfx::ScaleSize(size_, scale));
     SkBitmap empty_bitmap = GetEmptyBitmap(pixel_size);
     return gfx::ImageSkiaRep(empty_bitmap, scale);
@@ -233,11 +233,11 @@ class NetworkIconImageSource : public gfx::ImageSkiaSource {
       : icon_(icon),
         badges_(badges) {
   }
-  virtual ~NetworkIconImageSource() {}
+  ~NetworkIconImageSource() override {}
 
   // TODO(pkotwicz): Figure out what to do when a new image resolution becomes
   // available.
-  virtual gfx::ImageSkiaRep GetImageForScale(float scale) override {
+  gfx::ImageSkiaRep GetImageForScale(float scale) override {
     gfx::ImageSkiaRep icon_rep = icon_.GetRepresentation(scale);
     if (icon_rep.is_null())
       return gfx::ImageSkiaRep();