replace OVERRIDE and FINAL with override and final in ash/

ash/desktop_background/wallpaper_resizer_unittest.cc

Index: ash/desktop_background/wallpaper_resizer_unittest.cc
diff --git a/ash/desktop_background/wallpaper_resizer_unittest.cc b/ash/desktop_background/wallpaper_resizer_unittest.cc
index fb951ef265319a47817bd32891176a3dc3e264c5..97bd24903ed9b1a86ec3803e92e614b42f53f579 100644
--- a/ash/desktop_background/wallpaper_resizer_unittest.cc
+++ b/ash/desktop_background/wallpaper_resizer_unittest.cc
@@ -79,7 +79,7 @@ class WallpaperResizerTest : public testing::Test,
     message_loop_.Run();
   }
 
-  virtual void OnWallpaperResized() OVERRIDE {
+  virtual void OnWallpaperResized() override {
     message_loop_.Quit();
   }