base: Do not allow MessagePumpObservers to consume events.

ui/events/platform/x11/x11_event_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/platform/x11/x11_event_source.h"
 
 #include <glib.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/X.h>
 #include <X11/Xlib.h>
@@ skipping 178 matching lines @@
 
 uint32_t X11EventSource::DispatchEvent(XEvent* xevent) {
   bool have_cookie = false;
   if (xevent->type == GenericEvent &&
       XGetEventData(xevent->xgeneric.display, &xevent->xcookie)) {
     have_cookie = true;
   }
 
   // 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);
   return action;
 }
 
 scoped_ptr<PlatformEventSource> PlatformEventSource::CreateDefault() {
   return scoped_ptr<PlatformEventSource>(
       new X11EventSource(gfx::GetXDisplay()));
 }
 
 }  // namespace ui