Revert of Remove Client= from device/serial/data_stream.mojom.

device/serial/data_source_sender.h

Index: device/serial/data_source_sender.h
diff --git a/device/serial/data_source_sender.h b/device/serial/data_source_sender.h
index a8c2c634712e9a9a35e5f3ee23d95e1ee883da4d..3a90240fba844059e6d948f952adc186ddba4972 100644
--- a/device/serial/data_source_sender.h
+++ b/device/serial/data_source_sender.h
@@ -19,8 +19,7 @@
 // A DataSourceSender is an interface between a source of data and a
 // DataSourceClient.
 class DataSourceSender : public base::RefCounted<DataSourceSender>,
-                         public serial::DataSource,
-                         public mojo::ErrorHandler {
+                         public mojo::InterfaceImpl<serial::DataSource> {
  public:
   typedef base::Callback<void(scoped_ptr<WritableBuffer>)> ReadyCallback;
   typedef base::Callback<void()> ErrorCallback;
@@ -30,9 +29,7 @@
   // |ready_callback| will not be called again until the previous WritableBuffer
   // is destroyed. If a connection error occurs, |error_callback| will be
   // called and the DataSourceSender will act as if ShutDown() had been called.
-  DataSourceSender(mojo::InterfaceRequest<serial::DataSource> source,
-                   mojo::InterfacePtr<serial::DataSourceClient> client,
-                   const ReadyCallback& ready_callback,
+  DataSourceSender(const ReadyCallback& ready_callback,
                    const ErrorCallback& error_callback);
 
   // Shuts down this DataSourceSender. After shut down, |ready_callback| and
@@ -68,9 +65,6 @@
   // Reports a fatal error to the client and shuts down.
   void DispatchFatalError();
 
-  mojo::Binding<serial::DataSource> binding_;
-  mojo::InterfacePtr<serial::DataSourceClient> client_;
-
   // The callback to call when the client is ready for more data.
   ReadyCallback ready_callback_;