Make operators on scoped_ptr match the ones defined for std::unique_ptr

device/serial/serial_io_handler_win.cc

Index: device/serial/serial_io_handler_win.cc
diff --git a/device/serial/serial_io_handler_win.cc b/device/serial/serial_io_handler_win.cc
index cd1045107fe746e285d1bf422297236228339638..56fe93bbbf527589e0859171ce2627c3d5dffb61 100644
--- a/device/serial/serial_io_handler_win.cc
+++ b/device/serial/serial_io_handler_win.cc
@@ -282,7 +282,7 @@ void SerialIoHandlerWin::OnIOCompleted(
     DWORD bytes_transferred,
     DWORD error) {
   DCHECK(CalledOnValidThread());
-  if (context == comm_context_) {
+  if (context == comm_context_.get()) {
     DWORD errors;
     COMSTAT status;
     if (!ClearCommError(file().GetPlatformFile(), &errors, &status) ||
@@ -318,7 +318,7 @@ void SerialIoHandlerWin::OnIOCompleted(
         ReadCompleted(0, serial::RECEIVE_ERROR_SYSTEM_ERROR);
       }
     }
-  } else if (context == read_context_) {
+  } else if (context == read_context_.get()) {
     if (read_canceled()) {
       ReadCompleted(bytes_transferred, read_cancel_reason());
     } else if (error != ERROR_SUCCESS && error != ERROR_OPERATION_ABORTED) {
@@ -329,7 +329,7 @@ void SerialIoHandlerWin::OnIOCompleted(
                         ? serial::RECEIVE_ERROR_NONE
                         : serial::RECEIVE_ERROR_SYSTEM_ERROR);
     }
-  } else if (context == write_context_) {
+  } else if (context == write_context_.get()) {
     DCHECK(pending_write_buffer());
     if (write_canceled()) {
       WriteCompleted(0, write_cancel_reason());