Remove unneeded ScopedLayerAnimationSettings::LockTransitionDuration()

ui/compositor/layer_animator.h

Index: ui/compositor/layer_animator.h
diff --git a/ui/compositor/layer_animator.h b/ui/compositor/layer_animator.h
index a1e0ad2cd44a382a043d4e4de757ef5adf716e33..4704456f8a935b01764c1410f28bb58077418e8f 100644
--- a/ui/compositor/layer_animator.h
+++ b/ui/compositor/layer_animator.h
@@ -88,10 +88,6 @@ class COMPOSITOR_EXPORT LayerAnimator
   virtual void SetColor(SkColor color);
   SkColor GetTargetColor() const;
 
-  // Returns the default length of animations, including adjustment for slow
-  // animation mode if set.
-  base::TimeDelta GetTransitionDuration() const;
-
   // Sets the layer animation delegate the animator is associated with. The
   // animator does not own the delegate. The layer animator expects a non-NULL
   // delegate for most of its operations, so do not call any methods without
@@ -297,7 +293,11 @@ class COMPOSITOR_EXPORT LayerAnimator
   // starting the animation or adding to the queue.
   void OnScheduled(LayerAnimationSequence* sequence);
 
-  // Sets |transition_duration_| unless |is_transition_duration_locked_| is set.
+  // Returns the default length of animations, including adjustment for slow
+  // animation mode if set.
+  base::TimeDelta GetTransitionDuration() const;
+
+  // Sets |transition_duration_|.
   void SetTransitionDuration(base::TimeDelta duration);
 
   // Clears the animation queues and notifies any running animations that they
@@ -319,10 +319,6 @@ class COMPOSITOR_EXPORT LayerAnimator
   // Determines how animations are replaced.
   PreemptionStrategy preemption_strategy_;
 
-  // Whether the length of animations is locked. While it is locked
-  // SetTransitionDuration does not set |transition_duration_|.
-  bool is_transition_duration_locked_;
-
   // The default length of animations.
   base::TimeDelta transition_duration_;