Revert of cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

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 37cd8a690a4d729a72adb2642f09b4c47a8a4fdf..14a9ffd272d18baa7e2179330f52c765055118f0 100644
--- a/cc/trees/occlusion_tracker_perftest.cc
+++ b/cc/trees/occlusion_tracker_perftest.cc
@@ -38,7 +38,8 @@
     shared_bitmap_manager_.reset(new TestSharedBitmapManager());
     host_impl_ = LayerTreeHostImpl::Create(
         settings, &client_, &proxy_, &stats_, shared_bitmap_manager_.get(), 1);
-    host_impl_->InitializeRenderer(FakeOutputSurface::Create3d());
+    host_impl_->InitializeRenderer(
+        FakeOutputSurface::Create3d().PassAs<OutputSurface>());
 
     scoped_ptr<LayerImpl> root_layer = LayerImpl::Create(active_tree(), 1);
     active_tree()->SetRootLayer(root_layer.Pass());
@@ -85,7 +86,7 @@
   opaque_layer->SetDrawsContent(true);
   opaque_layer->SetBounds(viewport_rect.size());
   opaque_layer->SetContentBounds(viewport_rect.size());
-  active_tree()->root_layer()->AddChild(opaque_layer.Pass());
+  active_tree()->root_layer()->AddChild(opaque_layer.PassAs<LayerImpl>());
 
   active_tree()->UpdateDrawProperties();
   const LayerImplList& rsll = active_tree()->RenderSurfaceLayerList();
@@ -155,7 +156,7 @@
     opaque_layer->SetContentBounds(
         gfx::Size(viewport_rect.width() / 2, viewport_rect.height() / 2));
     opaque_layer->SetPosition(gfx::Point(i, i));
-    active_tree()->root_layer()->AddChild(opaque_layer.Pass());
+    active_tree()->root_layer()->AddChild(opaque_layer.PassAs<LayerImpl>());
   }
 
   active_tree()->UpdateDrawProperties();