Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/modules/webmidi/MIDIPort.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 #include "modules/webmidi/MIDIAccessor.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class MIDIAccess;
 
 class MIDIPort : public RefCountedGarbageCollectedEventTargetWithInlineData<MIDIPort>, public ActiveScriptWrappable, public ActiveDOMObject {
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(MIDIPort);
     DEFINE_WRAPPERTYPEINFO();
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(MIDIPort);
+    USING_GARBAGE_COLLECTED_MIXIN(MIDIPort);
 public:
     enum ConnectionState {
         ConnectionStateOpen,
         ConnectionStateClosed,
         ConnectionStatePending
     };
 
     enum TypeCode {
         TypeInput,
         TypeOutput
@@ skipping 48 matching lines @@
     TypeCode m_type;
     String m_version;
     Member<MIDIAccess> m_access;
     MIDIAccessor::MIDIPortState m_state;
     ConnectionState m_connection;
 };
 
 } // namespace blink
 
 #endif // MIDIPort_h