Fix a memory leak in the layer animator

ui/gfx/compositor/layer_animator.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gfx/compositor/layer_animator.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/animation/animation_container.h"
@@ skipping 378 matching lines @@
       else
         sequences[i]->Progress(sequences[i]->duration(), delegate());
     }
   }
 }
 
 void LayerAnimator::ImmediatelySetNewTarget(LayerAnimationSequence* sequence) {
   const bool abort = false;
   RemoveAllAnimationsWithACommonProperty(sequence, abort);
   scoped_ptr<LayerAnimationSequence> removed(RemoveAnimation(sequence));
+  if (!removed.get())
+    removed.reset(sequence);

[sky, 2012/02/09 03:48:56]

Add a comment here.

   sequence->Progress(sequence->duration(), delegate());
 }
 
 void LayerAnimator::ImmediatelyAnimateToNewTarget(
     LayerAnimationSequence* sequence) {
   const bool abort = true;
   RemoveAllAnimationsWithACommonProperty(sequence, abort);
   AddToQueueIfNotPresent(sequence);
   StartSequenceImmediately(sequence);
 }
@@ skipping 114 matching lines @@
     ObserverListBase<LayerAnimationObserver>::Iterator it(observers_);
     LayerAnimationObserver* obs;
     while ((obs = it.GetNext()) != NULL) {
       sequence->AddObserver(obs);
     }
   }
   sequence->OnScheduled();
 }
 
 }  // namespace ui