base: Do not allow MessagePumpObservers to consume events.

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 c4d2f46d09b5360c98c5a6b9332c9b411f7bb5b0..71a3fb5a93f6eea5ce20a29d64d416eb55156a5e 100644
--- a/ui/events/platform/x11/x11_event_source.cc
+++ b/ui/events/platform/x11/x11_event_source.cc
@@ -196,11 +196,9 @@ uint32_t X11EventSource::DispatchEvent(XEvent* xevent) {
 
   // TODO(sad): Remove this once all MessagePumpObservers are turned into
   // PlatformEventObservers.
-  uint32_t action = ui::POST_DISPATCH_NONE;
-  if (!base::MessagePumpX11::Current()->WillProcessXEvent(xevent)) {
-    action = PlatformEventSource::DispatchEvent(xevent);
-    base::MessagePumpX11::Current()->DidProcessXEvent(xevent);
-  }
+  base::MessagePumpX11::Current()->WillProcessXEvent(xevent);
+  uint32_t action = PlatformEventSource::DispatchEvent(xevent);
+  base::MessagePumpX11::Current()->DidProcessXEvent(xevent);
 
   if (have_cookie)
     XFreeEventData(xevent->xgeneric.display, &xevent->xcookie);