[cc] Make LayerImpls point at LayerTreeImpl instead of LTHI

cc/layer_sorter_unittest.cc

Index: cc/layer_sorter_unittest.cc
diff --git a/cc/layer_sorter_unittest.cc b/cc/layer_sorter_unittest.cc
index da86383ab691998a9ba5830c95c2f057d87c816f..969810b721096ec5f282cbae01ad9853fe3966f6 100644
--- a/cc/layer_sorter_unittest.cc
+++ b/cc/layer_sorter_unittest.cc
@@ -202,11 +202,11 @@ TEST(LayerSorterTest, verifyExistingOrderingPreservedWhenNoZDiff)
     FakeImplProxy proxy;
     FakeLayerTreeHostImpl hostImpl(&proxy);
 
-    scoped_ptr<LayerImpl> layer1 = LayerImpl::create(&hostImpl, 1);
-    scoped_ptr<LayerImpl> layer2 = LayerImpl::create(&hostImpl, 2);
-    scoped_ptr<LayerImpl> layer3 = LayerImpl::create(&hostImpl, 3);
-    scoped_ptr<LayerImpl> layer4 = LayerImpl::create(&hostImpl, 4);
-    scoped_ptr<LayerImpl> layer5 = LayerImpl::create(&hostImpl, 5);
+    scoped_ptr<LayerImpl> layer1 = LayerImpl::create(hostImpl.activeTree(), 1);
+    scoped_ptr<LayerImpl> layer2 = LayerImpl::create(hostImpl.activeTree(), 2);
+    scoped_ptr<LayerImpl> layer3 = LayerImpl::create(hostImpl.activeTree(), 3);
+    scoped_ptr<LayerImpl> layer4 = LayerImpl::create(hostImpl.activeTree(), 4);
+    scoped_ptr<LayerImpl> layer5 = LayerImpl::create(hostImpl.activeTree(), 5);
 
     gfx::Transform BehindMatrix;
     BehindMatrix.Translate3d(0, 0, 2);