Revert of cc: Move data to LayerTree from LayerTreeHost.

cc/trees/layer_tree_host_pixeltest_filters.cc

Index: cc/trees/layer_tree_host_pixeltest_filters.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_filters.cc b/cc/trees/layer_tree_host_pixeltest_filters.cc
index 241ce6ff7341795afb13f3d8ea18a571807d0338..27f8e2c9aff16851bd08cb3ebec67e8625ae1c63 100644
--- a/cc/trees/layer_tree_host_pixeltest_filters.cc
+++ b/cc/trees/layer_tree_host_pixeltest_filters.cc
@@ -170,7 +170,7 @@
   }
 
   void SetupTree() override {
-    layer_tree()->SetDeviceScaleFactor(device_scale_factor_);
+    layer_tree_host()->SetDeviceScaleFactor(device_scale_factor_);
     LayerTreePixelTest::SetupTree();
   }
 
@@ -900,7 +900,7 @@
   }
 
   void SetupTree() override {
-    layer_tree()->SetDeviceScaleFactor(device_scale_factor_);
+    layer_tree_host()->SetDeviceScaleFactor(device_scale_factor_);
     LayerTreeHostFiltersPixelTest::SetupTree();
   }