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

cc/test/fake_layer_tree_host_client.cc

Index: cc/test/fake_layer_tree_host_client.cc
diff --git a/cc/test/fake_layer_tree_host_client.cc b/cc/test/fake_layer_tree_host_client.cc
index 17ed10c0af5b9f81d906760fc5313b253cfac987..087cbb150e239f5f4b00a66e692eb33295edc843 100644
--- a/cc/test/fake_layer_tree_host_client.cc
+++ b/cc/test/fake_layer_tree_host_client.cc
@@ -27,15 +27,17 @@
   if (use_software_rendering_) {
     if (use_delegating_renderer_) {
       surface = FakeOutputSurface::CreateDelegatingSoftware(
-          make_scoped_ptr(new SoftwareOutputDevice));
+                    make_scoped_ptr(new SoftwareOutputDevice))
+                    .PassAs<OutputSurface>();
     } else {
       surface = FakeOutputSurface::CreateSoftware(
-          make_scoped_ptr(new SoftwareOutputDevice));
+                    make_scoped_ptr(new SoftwareOutputDevice))
+                    .PassAs<OutputSurface>();
     }
   } else if (use_delegating_renderer_) {
-    surface = FakeOutputSurface::CreateDelegating3d();
+    surface = FakeOutputSurface::CreateDelegating3d().PassAs<OutputSurface>();
   } else {
-    surface = FakeOutputSurface::Create3d();
+    surface = FakeOutputSurface::Create3d().PassAs<OutputSurface>();
   }
   host_->SetOutputSurface(surface.Pass());
 }