x11: Remove MessagePumpObserver.

ui/events/platform/x11/x11_event_source.cc

Index: ui/events/platform/x11/x11_event_source.cc
diff --git a/ui/events/platform/x11/x11_event_source.cc b/ui/events/platform/x11/x11_event_source.cc
index 865fdb1a2c67eefda30bde43c89770355340c21c..910578f0bfa435672a9b54c13957cb8436bcea78 100644
--- a/ui/events/platform/x11/x11_event_source.cc
+++ b/ui/events/platform/x11/x11_event_source.cc
@@ -11,7 +11,6 @@
 #include <X11/XKBlib.h>
 
 #include "base/logging.h"
-#include "base/message_loop/message_loop.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/x/x11_types.h"
@@ -195,12 +194,7 @@ uint32_t X11EventSource::DispatchEvent(XEvent* xevent) {
     have_cookie = true;
   }
 
-  // TODO(sad): Remove this once all MessagePumpObservers are turned into
-  // PlatformEventObservers.
-  base::MessagePumpX11::Current()->WillProcessXEvent(xevent);
   uint32_t action = PlatformEventSource::DispatchEvent(xevent);
-  base::MessagePumpX11::Current()->DidProcessXEvent(xevent);
-
   if (xevent->type == GenericEvent &&
       xevent->xgeneric.evtype == XI_HierarchyChanged) {
     ui::UpdateDeviceList();