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

device/serial/serial_service_impl.h

Index: device/serial/serial_service_impl.h
diff --git a/device/serial/serial_service_impl.h b/device/serial/serial_service_impl.h
index 8e6ce3bfce7e64275618a1dc735ac2772fd4d766..0caf00ee3bbb1a2ae5ec3e3872e1662e4ff5bb35 100644
--- a/device/serial/serial_service_impl.h
+++ b/device/serial/serial_service_impl.h
@@ -36,14 +36,11 @@
   void GetDevices(
       const mojo::Callback<void(mojo::Array<serial::DeviceInfoPtr>)>& callback)
       override;
-  void Connect(
-      const mojo::String& path,
-      serial::ConnectionOptionsPtr options,
-      mojo::InterfaceRequest<serial::Connection> connection_request,
-      mojo::InterfaceRequest<serial::DataSink> sink,
-      mojo::InterfacePtr<serial::DataSinkClient> sink_client,
-      mojo::InterfaceRequest<serial::DataSource> source,
-      mojo::InterfacePtr<serial::DataSourceClient> source_client) override;
+  void Connect(const mojo::String& path,
+               serial::ConnectionOptionsPtr options,
+               mojo::InterfaceRequest<serial::Connection> connection_request,
+               mojo::InterfaceRequest<serial::DataSink> sink,
+               mojo::InterfaceRequest<serial::DataSource> source) override;
 
  private:
   SerialDeviceEnumerator* GetDeviceEnumerator();