base: Do not allow MessagePumpObservers to consume events.

ui/aura/device_list_updater_aurax11.cc

Index: ui/aura/device_list_updater_aurax11.cc
diff --git a/ui/aura/device_list_updater_aurax11.cc b/ui/aura/device_list_updater_aurax11.cc
index 8240cb495c3d027435d472839d4ee08f415383a8..0bbde9edadcdb9a3638b0d175f116120e4820f80 100644
--- a/ui/aura/device_list_updater_aurax11.cc
+++ b/ui/aura/device_list_updater_aurax11.cc
@@ -14,7 +14,7 @@ DeviceListUpdaterAuraX11::DeviceListUpdaterAuraX11() {}
 
 DeviceListUpdaterAuraX11::~DeviceListUpdaterAuraX11() {}
 
-base::EventStatus DeviceListUpdaterAuraX11::WillProcessEvent(
+void DeviceListUpdaterAuraX11::WillProcessEvent(
     const base::NativeEvent& event) {
   // XI_HierarchyChanged events are special. There is no window associated with
   // these events. So process them directly from here.
@@ -22,8 +22,6 @@ base::EventStatus DeviceListUpdaterAuraX11::WillProcessEvent(
       event->xgeneric.evtype == XI_HierarchyChanged) {
     ui::UpdateDeviceList();
   }
-
-  return base::EVENT_CONTINUE;
 }
 
 void DeviceListUpdaterAuraX11::DidProcessEvent(const base::NativeEvent& event) {