base: Do not allow MessagePumpObservers to consume events.

base/message_loop/message_pump_observer.h

Index: base/message_loop/message_pump_observer.h
diff --git a/base/message_loop/message_pump_observer.h b/base/message_loop/message_pump_observer.h
index 333a75f1cbb4be2eafec08beb32e7ab924049004..1e8a7f53166e4971a0fb37e6ecae904c3a81ad04 100644
--- a/base/message_loop/message_pump_observer.h
+++ b/base/message_loop/message_pump_observer.h
@@ -10,13 +10,6 @@
 
 namespace base {
 
-enum EventStatus {
-  EVENT_CONTINUE,    // The event should be dispatched as normal.
-#if defined(USE_X11)
-  EVENT_HANDLED      // The event should not be processed any farther.
-#endif
-};
-
 // A MessagePumpObserver is an object that receives global
 // notifications from the UI MessageLoop with MessagePumpWin or
 // MessagePumpX11.
@@ -27,15 +20,10 @@ enum EventStatus {
 // info about how this is invoked in this environment.
 class BASE_EXPORT MessagePumpObserver {
  public:
-  // This method is called before processing a NativeEvent. If the
-  // method returns EVENT_HANDLED, it indicates the event has already
-  // been handled, so the event is not processed any farther. If the
-  // method returns EVENT_CONTINUE, the event dispatching proceeds as
-  // normal.
-  virtual EventStatus WillProcessEvent(const NativeEvent& event) = 0;
-
-  // This method is called after processing a message. This method
-  // will not be called if WillProcessEvent returns EVENT_HANDLED.
+  // This method is called before processing a NativeEvent.
+  virtual void WillProcessEvent(const NativeEvent& event) = 0;
+
+  // This method is called after processing a message.
   virtual void DidProcessEvent(const NativeEvent& event) = 0;
 
  protected: