[Ozone] Fix disabling keyboard in maximized mode

ui/events/ozone/evdev/event_converter_evdev_impl.h

Index: ui/events/ozone/evdev/event_converter_evdev_impl.h
diff --git a/ui/events/ozone/evdev/event_converter_evdev_impl.h b/ui/events/ozone/evdev/event_converter_evdev_impl.h
index f0f0b8aff5c1087aace0532750dc780210f5e43e..cc54229221645720ddf9cc172257368aa1201e25 100644
--- a/ui/events/ozone/evdev/event_converter_evdev_impl.h
+++ b/ui/events/ozone/evdev/event_converter_evdev_impl.h
@@ -5,7 +5,7 @@
 #ifndef UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
 #define UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
 
-#include <set>
+#include <bitset>
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_pump_libevent.h"
@@ -80,9 +80,8 @@ class EVENTS_OZONE_EVDEV_EXPORT EventConverterEvdevImpl
   // Controller for watching the input fd.
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
-  // The keys which should be processed. nullptr if all keys should be
-  // processed.
-  scoped_ptr<std::set<DomCode>> allowed_keys_;
+  // The evdev codes of the keys which should be blocked.
+  std::bitset<KEY_CNT> blocked_keys_;
 
   // Pressed keys bitset.
   std::bitset<KEY_CNT> key_state_;