cc: Clean up OcclusionTracker template parameters.

cc/trees/occlusion_tracker_perftest.cc

Index: cc/trees/occlusion_tracker_perftest.cc
diff --git a/cc/trees/occlusion_tracker_perftest.cc b/cc/trees/occlusion_tracker_perftest.cc
index f4a2fafcc298ef22d273c1919844906d9176809c..344e48cd1e76ffa562b7e01c2355d3d334af24a8 100644
--- a/cc/trees/occlusion_tracker_perftest.cc
+++ b/cc/trees/occlusion_tracker_perftest.cc
@@ -71,8 +71,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_FullyOccluded) {
   SetTestName("unoccluded_content_rect_fully_occluded");
 
   gfx::Rect viewport_rect(768, 1038);
-  OcclusionTrackerBase<LayerImpl, LayerImpl::RenderSurfaceType> tracker(
-      viewport_rect, false);
+  OcclusionTracker<LayerImpl> tracker(viewport_rect, false);
 
   CreateHost();
   host_impl_->SetViewportSize(viewport_rect.size());
@@ -140,8 +139,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_10OpaqueLayers) {
   SetTestName("unoccluded_content_rect_10_opaque_layers");
 
   gfx::Rect viewport_rect(768, 1038);
-  OcclusionTrackerBase<LayerImpl, LayerImpl::RenderSurfaceType> tracker(
-      viewport_rect, false);
+  OcclusionTracker<LayerImpl> tracker(viewport_rect, false);
 
   CreateHost();
   host_impl_->SetViewportSize(viewport_rect.size());