Privatize StrongBinding lifetime management

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 464e4aede2f4e08e34eb881ea8ade667a343278c..68538974541ec2ee5739c95bf5f206fcc5138621 100644
--- a/device/serial/serial_service_impl.h
+++ b/device/serial/serial_service_impl.h
@@ -14,17 +14,15 @@
 #include "device/serial/serial.mojom.h"
 #include "device/serial/serial_connection_factory.h"
 #include "device/serial/serial_device_enumerator.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace device {
 
 class SerialServiceImpl : public serial::SerialService {
  public:
+  explicit SerialServiceImpl(
+      scoped_refptr<SerialConnectionFactory> connection_factory);
   SerialServiceImpl(scoped_refptr<SerialConnectionFactory> connection_factory,
-                    mojo::InterfaceRequest<serial::SerialService> request);
-  SerialServiceImpl(scoped_refptr<SerialConnectionFactory> connection_factory,
-                    std::unique_ptr<SerialDeviceEnumerator> device_enumerator,
-                    mojo::InterfaceRequest<serial::SerialService> request);
+                    std::unique_ptr<SerialDeviceEnumerator> device_enumerator);
   ~SerialServiceImpl() override;
 
   static void Create(scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
@@ -52,7 +50,6 @@ class SerialServiceImpl : public serial::SerialService {
 
   std::unique_ptr<SerialDeviceEnumerator> device_enumerator_;
   scoped_refptr<SerialConnectionFactory> connection_factory_;
-  mojo::StrongBinding<serial::SerialService> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(SerialServiceImpl);
 };