[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/quad_culler_unittest.cc

Index: cc/quad_culler_unittest.cc
diff --git a/cc/quad_culler_unittest.cc b/cc/quad_culler_unittest.cc
index d17c3318bd20e7105bd4a8f3427bdf2b1fd1532a..1dd64d8d0901161fbf3dc0d9b843a5ce3b49fa66 100644
--- a/cc/quad_culler_unittest.cc
+++ b/cc/quad_culler_unittest.cc
@@ -48,7 +48,7 @@ public:
 
     scoped_ptr<TiledLayerImpl> makeLayer(TiledLayerImpl* parent, const gfx::Transform& drawTransform, const gfx::Rect& layerRect, float opacity, bool opaque, const gfx::Rect& layerOpaqueRect, std::vector<LayerImpl*>& surfaceLayerList)
     {
-        scoped_ptr<TiledLayerImpl> layer = TiledLayerImpl::create(&m_hostImpl, 1);
+        scoped_ptr<TiledLayerImpl> layer = TiledLayerImpl::create(m_hostImpl.activeTree(), 1);
         scoped_ptr<LayerTilingData> tiler = LayerTilingData::create(gfx::Size(100, 100), LayerTilingData::NoBorderTexels);
         tiler->setBounds(layerRect.size());
         layer->setTilingData(*tiler);