base: Do not allow MessagePumpObservers to consume events.

chrome/browser/chromeos/events/event_rewriter.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 "chrome/browser/chromeos/events/event_rewriter.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/keysym.h>
 #include <X11/XF86keysym.h>
 #include <X11/Xlib.h>
@@ skipping 175 matching lines @@
       device_id_to_type_.find(device_id);
   if (iter == device_id_to_type_.end()) {
     // |device_id| is unknown. This means the device was connected before
     // booting the OS. Query the name of the device and add it to the map.
     DeviceAdded(device_id);
   }
 
   last_device_id_ = device_id;
 }
 
-base::EventStatus EventRewriter::WillProcessEvent(
-    const base::NativeEvent& event) {
+void EventRewriter::WillProcessEvent(const base::NativeEvent& event) {
   XEvent* xevent = event;
   if (xevent->type == KeyPress || xevent->type == KeyRelease) {
     Rewrite(xevent);
   } else if (xevent->type == GenericEvent) {
     XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xevent->xcookie.data);
     if (xievent->evtype == XI_KeyPress || xievent->evtype == XI_KeyRelease) {
       if (xievent->deviceid == xievent->sourceid)
         DeviceKeyPressedOrReleased(xievent->deviceid);
     } else {
       RewriteLocatedEvent(xevent);
     }
   } else if (xevent->type == MappingNotify) {
     if (xevent->xmapping.request == MappingModifier ||
         xevent->xmapping.request == MappingKeyboard) {
       RefreshKeycodes();
     }
   }
-  return base::EVENT_CONTINUE;
 }
 
 void EventRewriter::DidProcessEvent(const base::NativeEvent& event) {
 }
 
 void EventRewriter::DeviceHierarchyChanged() {}
 
 void EventRewriter::DeviceAdded(int device_id) {
   DCHECK_NE(XIAllDevices, device_id);
   DCHECK_NE(XIAllMasterDevices, device_id);
@@ skipping 667 matching lines @@
     VLOG(1) << "Apple keyboard '" << device_name << "' connected: "
             << "id=" << device_id;
   }
   // Always overwrite the existing device_id since the X server may reuse a
   // device id for an unattached device.
   device_id_to_type_[device_id] = type;
   return type;
 }
 
 }  // namespace chromeos