Make ui::Layer use the cc:LayerTreeHost scale factor directly

ui/views/view_unittest.cc

Index: ui/views/view_unittest.cc
diff --git a/ui/views/view_unittest.cc b/ui/views/view_unittest.cc
index 3685673ecc9834ee048f2dd431856c0b06de79e7..6af6b3a1612a4d4a55e5a069c0014c15e01e0578 100644
--- a/ui/views/view_unittest.cc
+++ b/ui/views/view_unittest.cc
@@ -3363,17 +3363,6 @@ TEST_F(ViewLayerTest, AcquireLayer) {
   c1.reset();
 }
 
-// Verify that new layer scales content only if the old layer does.
-TEST_F(ViewLayerTest, RecreateLayerScaling) {
-  scoped_ptr<View> v(new View());
-  v->SetPaintToLayer(true);
-  // Set to non default value.
-  v->layer()->set_scale_content(false);
-  scoped_ptr<ui::Layer> old_layer(v->RecreateLayer());
-  ui::Layer* new_layer = v->layer();
-  EXPECT_FALSE(new_layer->scale_content());
-}
-
 // Verify the z-order of the layers as a result of calling RecreateLayer().
 TEST_F(ViewLayerTest, RecreateLayerZOrder) {
   scoped_ptr<View> v(new View());