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

cc/output/renderer_unittest.cc

Index: cc/output/renderer_unittest.cc
diff --git a/cc/output/renderer_unittest.cc b/cc/output/renderer_unittest.cc
index 99ff89d569388346406ee7bbc4276bbc6db9975c..1d54608ee7a446e02e0bc3b646e7ced5757b0f7a 100644
--- a/cc/output/renderer_unittest.cc
+++ b/cc/output/renderer_unittest.cc
@@ -38,7 +38,8 @@
     OutputSurface* output_surface,
     ResourceProvider* resource_provider) {
   return DelegatingRenderer::Create(
-      client, settings, output_surface, resource_provider);
+             client, settings, output_surface, resource_provider)
+      .PassAs<Renderer>();
 }
 
 template <>
@@ -48,7 +49,8 @@
     OutputSurface* output_surface,
     ResourceProvider* resource_provider) {
   return GLRenderer::Create(
-      client, settings, output_surface, resource_provider, NULL, 0);
+             client, settings, output_surface, resource_provider, NULL, 0)
+      .PassAs<Renderer>();
 }
 
 template <typename T>