Convert mojo::system::Dispatcher to use our new refcounting stuff (instead of base's).

mojo/edk/system/data_pipe_producer_dispatcher.cc

Index: mojo/edk/system/data_pipe_producer_dispatcher.cc
diff --git a/mojo/edk/system/data_pipe_producer_dispatcher.cc b/mojo/edk/system/data_pipe_producer_dispatcher.cc
index cb712d39e7bfe4cfab9333cf4a92ffa7e261a2ac..55ee7359631547335556049cd53972077663f598 100644
--- a/mojo/edk/system/data_pipe_producer_dispatcher.cc
+++ b/mojo/edk/system/data_pipe_producer_dispatcher.cc
@@ -23,16 +23,16 @@ Dispatcher::Type DataPipeProducerDispatcher::GetType() const {
 }
 
 // static
-scoped_refptr<DataPipeProducerDispatcher>
-DataPipeProducerDispatcher::Deserialize(Channel* channel,
-                                        const void* source,
-                                        size_t size) {
+RefPtr<DataPipeProducerDispatcher> DataPipeProducerDispatcher::Deserialize(
+    Channel* channel,
+    const void* source,
+    size_t size) {
   RefPtr<DataPipe> data_pipe;
   if (!DataPipe::ProducerDeserialize(channel, source, size, &data_pipe))
     return nullptr;
   DCHECK(data_pipe);
 
-  scoped_refptr<DataPipeProducerDispatcher> dispatcher = Create();
+  auto dispatcher = DataPipeProducerDispatcher::Create();
   dispatcher->Init(std::move(data_pipe));
   return dispatcher;
 }
@@ -61,13 +61,13 @@ void DataPipeProducerDispatcher::CloseImplNoLock() {
   data_pipe_ = nullptr;
 }
 
-scoped_refptr<Dispatcher>
+RefPtr<Dispatcher>
 DataPipeProducerDispatcher::CreateEquivalentDispatcherAndCloseImplNoLock() {
   mutex().AssertHeld();
 
-  scoped_refptr<DataPipeProducerDispatcher> rv = Create();
-  rv->Init(std::move(data_pipe_));
-  return scoped_refptr<Dispatcher>(rv.get());
+  auto dispatcher = DataPipeProducerDispatcher::Create();
+  dispatcher->Init(std::move(data_pipe_));
+  return dispatcher;
 }
 
 MojoResult DataPipeProducerDispatcher::WriteDataImplNoLock(
@@ -126,7 +126,7 @@ void DataPipeProducerDispatcher::StartSerializeImplNoLock(
     Channel* channel,
     size_t* max_size,
     size_t* max_platform_handles) {
-  DCHECK(HasOneRef());  // Only one ref => no need to take the lock.
+  AssertHasOneRef();  // Only one ref => no need to take the lock.
   data_pipe_->ProducerStartSerialize(channel, max_size, max_platform_handles);
 }
 
@@ -135,7 +135,7 @@ bool DataPipeProducerDispatcher::EndSerializeAndCloseImplNoLock(
     void* destination,
     size_t* actual_size,
     embedder::PlatformHandleVector* platform_handles) {
-  DCHECK(HasOneRef());  // Only one ref => no need to take the lock.
+  AssertHasOneRef();  // Only one ref => no need to take the lock.
 
   bool rv = data_pipe_->ProducerEndSerialize(channel, destination, actual_size,
                                              platform_handles);