gtk: Some code cleanup for the message-pump.

base/message_loop/message_pump_aurax11.cc

Index: base/message_loop/message_pump_aurax11.cc
diff --git a/base/message_loop/message_pump_aurax11.cc b/base/message_loop/message_pump_aurax11.cc
index 1f91a0e359ac3f23c38bda78a3924bcf407938f8..54be49f65f9cf6e1cf087642c90885dd9885cbc5 100644
--- a/base/message_loop/message_pump_aurax11.cc
+++ b/base/message_loop/message_pump_aurax11.cc
@@ -184,6 +184,14 @@ void MessagePumpAuraX11::RemoveDispatcherForRootWindow(
   root_window_dispatchers_.RemoveObserver(dispatcher);
 }
 
+void MessagePumpAuraX11::AddObserver(MessagePumpObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void MessagePumpAuraX11::RemoveObserver(MessagePumpObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 bool MessagePumpAuraX11::DispatchXEvents() {
   Display* display = GetDefaultXDisplay();
   DCHECK(display);