base: Do not allow MessagePumpObservers to consume events.

ui/aura/window_tree_host_x11.cc

Index: ui/aura/window_tree_host_x11.cc
diff --git a/ui/aura/window_tree_host_x11.cc b/ui/aura/window_tree_host_x11.cc
index afb4d41da58172ec34fc660aacbf7ef390640de8..525694b793aca1993f6fcc5efd95f0461c0c769e 100644
--- a/ui/aura/window_tree_host_x11.cc
+++ b/ui/aura/window_tree_host_x11.cc
@@ -208,8 +208,7 @@ class TouchEventCalibrate : public base::MessagePumpObserver {
 
  private:
   // Overridden from base::MessagePumpObserver:
-  virtual base::EventStatus WillProcessEvent(
-      const base::NativeEvent& event) OVERRIDE {
+  virtual void WillProcessEvent(const base::NativeEvent& event) OVERRIDE {
 #if defined(USE_XI2_MT)
     if (event->type == GenericEvent &&
         (event->xgeneric.evtype == XI_TouchBegin ||
@@ -221,7 +220,6 @@ class TouchEventCalibrate : public base::MessagePumpObserver {
       xievent->event_y = xievent->root_y;
     }
 #endif  // defined(USE_XI2_MT)
-    return base::EVENT_CONTINUE;
   }
 
   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE {