Change TypeConverter<X,Y>::ConvertFrom and ConvertTo into a single symmetric

mojo/services/surfaces/surfaces_impl.cc

 // Copyright 2014 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 "mojo/services/surfaces/surfaces_impl.h"
 
 #include "cc/output/compositor_frame.h"
 #include "cc/resources/returned_resource.h"
 #include "cc/surfaces/display.h"
 #include "cc/surfaces/surface_id_allocator.h"
@@ skipping 27 matching lines @@
 
 void SurfacesImpl::SubmitFrame(SurfaceIdPtr id, FramePtr frame_ptr) {
   cc::SurfaceId cc_id = id.To<cc::SurfaceId>();
   if (cc::SurfaceIdAllocator::NamespaceForId(cc_id) != id_namespace_) {
     // Bad message, do something bad to the caller?
     LOG(FATAL) << "Received frame for id " << cc_id.id << " namespace "
                << cc::SurfaceIdAllocator::NamespaceForId(cc_id)
                << " should be namespace " << id_namespace_;
     return;
   }
-  factory_.SubmitFrame(
-      id.To<cc::SurfaceId>(), mojo::ConvertTo(frame_ptr), base::Closure());
+  factory_.SubmitFrame(id.To<cc::SurfaceId>(),
+                       frame_ptr.To<scoped_ptr<cc::CompositorFrame> >(),
+                       base::Closure());
   client_->FrameSubmitted();
 }
 
 void SurfacesImpl::DestroySurface(SurfaceIdPtr id) {
   cc::SurfaceId cc_id = id.To<cc::SurfaceId>();
   if (cc::SurfaceIdAllocator::NamespaceForId(cc_id) != id_namespace_) {
     // Bad message, do something bad to the caller?
     NOTREACHED();
     return;
   }
@@ skipping 31 matching lines @@
 
 scoped_ptr<cc::OutputSurface> SurfacesImpl::CreateOutputSurface() {
   return make_scoped_ptr(new cc::OutputSurface(
       new ContextProviderMojo(command_buffer_handle_.Pass())));
 }
 
 void SurfacesImpl::DisplayDamaged() {
 }
 
 }  // namespace mojo