Remove last uses of InterfaceImpl<> in Sky C++ code

sky/viewer/viewer.cc

Index: sky/viewer/viewer.cc
diff --git a/sky/viewer/viewer.cc b/sky/viewer/viewer.cc
index 7ca33ee01a67061b3b2dc24615c1a4a2451138b1..192c83a48e4f82354d92ad07931a8b12ce05bfb9 100644
--- a/sky/viewer/viewer.cc
+++ b/sky/viewer/viewer.cc
@@ -50,7 +50,7 @@ class Viewer : public mojo::ApplicationDelegate,
   // Overridden from InterfaceFactory<ContentHandler>
   virtual void Create(mojo::ApplicationConnection* connection,
                       mojo::InterfaceRequest<mojo::ContentHandler> request) override {
-    mojo::BindToRequest(new ContentHandlerImpl(), &request);
+    new ContentHandlerImpl(request.Pass());
   }
 
   scoped_ptr<PlatformImpl> platform_impl_;