Revert of cc: nine patch: add occlusion support

cc/layers/nine_patch_layer.cc

Index: cc/layers/nine_patch_layer.cc
diff --git a/cc/layers/nine_patch_layer.cc b/cc/layers/nine_patch_layer.cc
index 84aaee542c47e7ce86d05ec9a73ca7eaa723d704..b68891cf51e3d44e1dcfcdda97003bbf90030163 100644
--- a/cc/layers/nine_patch_layer.cc
+++ b/cc/layers/nine_patch_layer.cc
@@ -57,14 +57,6 @@
   SetNeedsCommit();
 }
 
-void NinePatchLayer::SetLayerOcclusion(const gfx::Rect& occlusion) {
-  if (layer_occlusion_ == occlusion)
-    return;
-
-  layer_occlusion_ = occlusion;
-  SetNeedsCommit();
-}
-
 void NinePatchLayer::PushPropertiesTo(LayerImpl* layer) {
   UIResourceLayer::PushPropertiesTo(layer);
   TRACE_EVENT0("cc", "NinePatchLayer::PushPropertiesTo");
@@ -75,8 +67,8 @@
   } else {
     DCHECK(layer_tree_host());
 
-    layer_impl->SetLayout(image_aperture_, border_, layer_occlusion_,
-                          fill_center_, nearest_neighbor_);
+    layer_impl->SetLayout(image_aperture_, border_, fill_center_,
+                          nearest_neighbor_);
   }
 }