cc: Clean up OcclusionTracker template parameters.

cc/layers/picture_layer_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/resources/resource_update_queue.h"
 #include "cc/test/fake_layer_tree_host.h"
@@ skipping 17 matching lines @@
 TEST(PictureLayerTest, NoTilesIfEmptyBounds) {
   MockContentLayerClient client;
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   layer->SetBounds(gfx::Size(10, 10));
 
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create();
   host->SetRootLayer(layer);
   layer->SetIsDrawable(true);
   layer->SavePaintProperties();
 
-  OcclusionTracker occlusion(gfx::Rect(0, 0, 1000, 1000), false);
+  OcclusionTracker<Layer> occlusion(gfx::Rect(0, 0, 1000, 1000), false);
   scoped_ptr<ResourceUpdateQueue> queue(new ResourceUpdateQueue);
   layer->Update(queue.get(), &occlusion);
 
   layer->SetBounds(gfx::Size(0, 0));
   layer->SavePaintProperties();
   // Intentionally skipping Update since it would normally be skipped on
   // a layer with empty bounds.
 
   FakeProxy proxy;
 #ifndef NDEBUG
@@ skipping 11 matching lines @@
     EXPECT_TRUE(layer_impl->pile()->size() == gfx::Size(0, 0));
     EXPECT_TRUE(layer_impl->pile()->recorded_region().IsEmpty());
   }
 #ifndef NDEBUG
   proxy.SetCurrentThreadIsImplThread(false);
 #endif
 }
 
 }  // namespace
 }  // namespace cc