Oilpan: Remove most WillBe types from the code base

third_party/WebKit/Source/core/fileapi/FileReader.h

 /*
  * Copyright (C) 2010 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 34 matching lines @@
 
 class Blob;
 class DOMArrayBuffer;
 class ExceptionState;
 class ExecutionContext;
 class StringOrArrayBuffer;
 
 class CORE_EXPORT FileReader final : public RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>, public ActiveDOMObject, public FileReaderLoaderClient {
     DEFINE_WRAPPERTYPEINFO();
     REFCOUNTED_GARBAGE_COLLECTED_EVENT_TARGET(FileReader);
-    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(FileReader);
+    USING_GARBAGE_COLLECTED_MIXIN(FileReader);
 public:
     static FileReader* create(ExecutionContext*);
 
     ~FileReader() override;
 
     enum ReadyState {
         EMPTY = 0,
         LOADING = 1,
         DONE = 2
     };
@@ skipping 64 matching lines @@
 
     OwnPtr<FileReaderLoader> m_loader;
     Member<FileError> m_error;
     double m_lastProgressNotificationTimeMS;
     int m_asyncOperationId;
 };
 
 } // namespace blink
 
 #endif // FileReader_h