ui: Fix clang warnings about missing virtual and OVERRIDE annotations.

ui/base/animation/animation_unittest.cc

Index: ui/base/animation/animation_unittest.cc
diff --git a/ui/base/animation/animation_unittest.cc b/ui/base/animation/animation_unittest.cc
index 3961aae688e1456decb5a2a2a5b2297f3927df2a..a2321c403daeed284c404f7ec5d481359f87557e 100644
--- a/ui/base/animation/animation_unittest.cc
+++ b/ui/base/animation/animation_unittest.cc
@@ -29,7 +29,7 @@ class RunAnimation : public LinearAnimation {
       : LinearAnimation(frame_rate, delegate) {
   }
 
-  virtual void AnimateToState(double state) {
+  virtual void AnimateToState(double state) OVERRIDE {
     EXPECT_LE(0.0, state);
     EXPECT_GE(1.0, state);
   }
@@ -44,7 +44,7 @@ class CancelAnimation : public LinearAnimation {
       : LinearAnimation(duration, frame_rate, delegate) {
   }
 
-  virtual void AnimateToState(double state) {
+  virtual void AnimateToState(double state) OVERRIDE {
     if (state >= 0.5)
       Stop();
   }
@@ -59,7 +59,7 @@ class EndAnimation : public LinearAnimation {
       : LinearAnimation(duration, frame_rate, delegate) {
   }
 
-  virtual void AnimateToState(double state) {
+  virtual void AnimateToState(double state) OVERRIDE {
     if (state >= 0.5)
       End();
   }
@@ -71,7 +71,7 @@ class EndAnimation : public LinearAnimation {
 // AnimationDelegate implementation that deletes the animation in ended.
 class DeletingAnimationDelegate : public AnimationDelegate {
  public:
-  virtual void AnimationEnded(const Animation* animation) {
+  virtual void AnimationEnded(const Animation* animation) OVERRIDE {
     delete animation;
     MessageLoop::current()->Quit();
   }