Remove unneeded ScopedLayerAnimationSettings::LockTransitionDuration()

ui/compositor/layer_animator.cc

Index: ui/compositor/layer_animator.cc
diff --git a/ui/compositor/layer_animator.cc b/ui/compositor/layer_animator.cc
index 0fad04a2cd252b73ad56ff3f8a37bd008ca3a01a..dd727a6c549458e3e9abbc326ec85aa7de2b0d98 100644
--- a/ui/compositor/layer_animator.cc
+++ b/ui/compositor/layer_animator.cc
@@ -55,7 +55,6 @@ gfx::AnimationContainer* GetAnimationContainer() {
 LayerAnimator::LayerAnimator(base::TimeDelta transition_duration)
     : delegate_(NULL),
       preemption_strategy_(IMMEDIATELY_SET_NEW_TARGET),
-      is_transition_duration_locked_(false),
       transition_duration_(transition_duration),
       tween_type_(gfx::Tween::LINEAR),
       is_started_(false),
@@ -119,10 +118,6 @@ ANIMATED_PROPERTY(float, BRIGHTNESS, Brightness, float, brightness);
 ANIMATED_PROPERTY(float, GRAYSCALE, Grayscale, float, grayscale);
 ANIMATED_PROPERTY(SkColor, COLOR, Color, SkColor, color);
 
-base::TimeDelta LayerAnimator::GetTransitionDuration() const {
-  return transition_duration_;
-}
-
 void LayerAnimator::SetDelegate(LayerAnimationDelegate* delegate) {
   delegate_ = delegate;
 }
@@ -815,10 +810,8 @@ void LayerAnimator::OnScheduled(LayerAnimationSequence* sequence) {
   sequence->OnScheduled();
 }
 
-void LayerAnimator::SetTransitionDuration(base::TimeDelta duration) {
-  if (is_transition_duration_locked_)
-    return;
-  transition_duration_ = duration;
+base::TimeDelta LayerAnimator::GetTransitionDuration() const {
+  return transition_duration_;
 }
 
 void LayerAnimator::ClearAnimationsInternal() {