Remove wall time from NotifyAnimationStarted and NotifyAnimationFinished.

cc/animation/animation_delegate.h

Index: cc/animation/animation_delegate.h
diff --git a/cc/animation/animation_delegate.h b/cc/animation/animation_delegate.h
index f1176a36a46fadfff393d56896200bbbde281b40..0f83bec44c63c0f74a88dae6b736ddc5dd4d6ed8 100644
--- a/cc/animation/animation_delegate.h
+++ b/cc/animation/animation_delegate.h
@@ -12,14 +12,10 @@ namespace cc {
 
 class AnimationDelegate {
  public:
-  // TODO(ajuma): Remove wall_clock_time once the legacy implementation of
-  // CSS animations and transitions in Blink is removed.
   virtual void NotifyAnimationStarted(
-      double wall_clock_time,
       base::TimeTicks monotonic_time,
       Animation::TargetProperty target_property) = 0;
   virtual void NotifyAnimationFinished(
-      double wall_clock_time,
       base::TimeTicks monotonic_time,
       Animation::TargetProperty target_property) = 0;