Revert https://codereview.chromium.org/105673008/ because the CL was causing a crash (http://crbug.com/335068)

BUG=335068
TEST=Crash stops occuring
TBR=pkotwicz

Review URL: https://codereview.chromium.org/130413004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245913 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/compositor/layer_animator.cc b/ui/compositor/layer_animator.cc
index f878897..0454152 100644
--- a/ui/compositor/layer_animator.cc
+++ b/ui/compositor/layer_animator.cc
@@ -55,6 +55,7 @@
 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),
@@ -118,6 +119,10 @@
 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;
 }
@@ -798,8 +803,10 @@
   sequence->OnScheduled();
 }
 
-base::TimeDelta LayerAnimator::GetTransitionDuration() const {
-  return transition_duration_;
+void LayerAnimator::SetTransitionDuration(base::TimeDelta duration) {
+  if (is_transition_duration_locked_)
+    return;
+  transition_duration_ = duration;
 }
 
 void LayerAnimator::ClearAnimationsInternal() {