Revert of Reduce ActiveDOMObjects from core/

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

 /*
  * 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 178 matching lines @@
 
     using FileReaderDeque = PersistentHeapDequeWillBeHeapDeque<Member<FileReader>>;
     using FileReaderHashSet = PersistentHeapHashSetWillBeHeapHashSet<Member<FileReader>>;
 
     FileReaderDeque m_pendingReaders;
     FileReaderHashSet m_runningReaders;
 };
 
 FileReader* FileReader::create(ExecutionContext* context)
 {
-    return new FileReader(context);
+    FileReader* fileReader = new FileReader(context);
+    fileReader->suspendIfNeeded();
+    return fileReader;
 }
 
 FileReader::FileReader(ExecutionContext* context)
-    : ContextLifecycleObserver(context)
+    : ActiveDOMObject(context)
     , m_state(EMPTY)
     , m_loadingState(LoadingStateNone)
     , m_readType(FileReaderLoader::ReadAsBinaryString)
     , m_lastProgressNotificationTimeMS(0)
     , m_asyncOperationId(0)
 {
 }
 
 FileReader::~FileReader()
 {
     terminate();
 }
 
 const AtomicString& FileReader::interfaceName() const
 {
     return EventTargetNames::FileReader;
 }
 
-void FileReader::contextDestroyed()
+void FileReader::stop()
 {
     // The delayed abort task tidies up and advances to the DONE state.
     if (m_loadingState == LoadingStateAborted)
         return;
 
     if (hasPendingActivity())
         ThrottlingController::finishReader(executionContext(), this, ThrottlingController::removeReader(executionContext(), this));
     terminate();
 }
 
@@ skipping 229 matching lines @@
     else
         dispatchEvent(ProgressEvent::create(type, false, m_loader->bytesLoaded(), 0));
 
     InspectorInstrumentation::traceAsyncCallbackCompleted(cookie);
 }
 
 DEFINE_TRACE(FileReader)
 {
     visitor->trace(m_error);
     RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>::trace(visitor);
-    ContextLifecycleObserver::trace(visitor);
+    ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink