cc: Make eviction queue building consistent with raster.

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 3fe5f4ac47fb704207c0bfd39391fbf3c8c98d1c..92107091f216af3ba0c638c94882b5e71a901b90 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -1217,12 +1217,14 @@ void LayerTreeHostImpl::BuildRasterQueue(RasterTilePriorityQueue* queue,
   }
 }
 
-void LayerTreeHostImpl::BuildEvictionQueue(EvictionTilePriorityQueue* queue,
-                                           TreePriority tree_priority) {
+scoped_ptr<EvictionTilePriorityQueue> LayerTreeHostImpl::BuildEvictionQueue(
+    TreePriority tree_priority) {
   TRACE_EVENT0("cc", "LayerTreeHostImpl::BuildEvictionQueue");
+  scoped_ptr<EvictionTilePriorityQueue> queue(new EvictionTilePriorityQueue);
   picture_layer_pairs_.clear();
   GetPictureLayerImplPairs(&picture_layer_pairs_, false);
   queue->Build(picture_layer_pairs_, tree_priority);
+  return queue;
 }
 
 const std::vector<PictureLayerImpl*>& LayerTreeHostImpl::GetPictureLayers()