cc: Clean up OcclusionTracker template parameters.

cc/test/fake_painted_scrollbar_layer.cc

Index: cc/test/fake_painted_scrollbar_layer.cc
diff --git a/cc/test/fake_painted_scrollbar_layer.cc b/cc/test/fake_painted_scrollbar_layer.cc
index 72ef420a89c26f4320a2cbdcef564e3fe57ffb98..b238d80bd86eb784e50b344e6d193cc83b1f2a7b 100644
--- a/cc/test/fake_painted_scrollbar_layer.cc
+++ b/cc/test/fake_painted_scrollbar_layer.cc
@@ -35,8 +35,9 @@ FakePaintedScrollbarLayer::FakePaintedScrollbarLayer(
 
 FakePaintedScrollbarLayer::~FakePaintedScrollbarLayer() {}
 
-bool FakePaintedScrollbarLayer::Update(ResourceUpdateQueue* queue,
-                                       const OcclusionTracker* occlusion) {
+bool FakePaintedScrollbarLayer::Update(
+    ResourceUpdateQueue* queue,
+    const OcclusionTracker<Layer>* occlusion) {
   bool updated = PaintedScrollbarLayer::Update(queue, occlusion);
   ++update_count_;
   return updated;