Update scoped_ptr references to be unique_ptr in src/base comments.

base/message_loop/message_pump_glib.h

Index: base/message_loop/message_pump_glib.h
diff --git a/base/message_loop/message_pump_glib.h b/base/message_loop/message_pump_glib.h
index a2b54d8542cf5cc73ae064200a1ca817e4929ee8..d79dba55a2a045715650439f977fd4b96a5be75b 100644
--- a/base/message_loop/message_pump_glib.h
+++ b/base/message_loop/message_pump_glib.h
@@ -69,7 +69,7 @@ class BASE_EXPORT MessagePumpGlib : public MessagePump {
   // Dispatch() will be called.
   int wakeup_pipe_read_;
   int wakeup_pipe_write_;
-  // Use a scoped_ptr to avoid needing the definition of GPollFD in the header.
+  // Use a unique_ptr to avoid needing the definition of GPollFD in the header.
   std::unique_ptr<GPollFD> wakeup_gpollfd_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePumpGlib);