Remove implicit conversions from scoped_refptr to T* in device/

device/serial/serial_io_handler.cc

Index: device/serial/serial_io_handler.cc
diff --git a/device/serial/serial_io_handler.cc b/device/serial/serial_io_handler.cc
index eb55e414e0053bd81354f619101fa52c1d62c0c3..816e139f3f5f4b66851ea914691d589eadb45395 100644
--- a/device/serial/serial_io_handler.cc
+++ b/device/serial/serial_io_handler.cc
@@ -26,7 +26,7 @@ void SerialIoHandler::Open(const std::string& port,
   DCHECK(CalledOnValidThread());
   DCHECK(open_complete_.is_null());
   open_complete_ = callback;
-  DCHECK(file_thread_message_loop_);
+  DCHECK(file_thread_message_loop_.get());
   file_thread_message_loop_->PostTask(
       FROM_HERE,
       base::Bind(&SerialIoHandler::StartOpen,
@@ -81,7 +81,7 @@ bool SerialIoHandler::PostOpen() {
 
 void SerialIoHandler::Close() {
   if (file_.IsValid()) {
-    DCHECK(file_thread_message_loop_);
+    DCHECK(file_thread_message_loop_.get());
     file_thread_message_loop_->PostTask(
         FROM_HERE, base::Bind(&SerialIoHandler::DoClose, Passed(file_.Pass())));
   }