Revert of Reduce ActiveDOMObjects from core/

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

Index: third_party/WebKit/Source/core/fileapi/FileReader.cpp
diff --git a/third_party/WebKit/Source/core/fileapi/FileReader.cpp b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
index b654c90a608f498e3a9e91a6ef20ea5678c97c4a..c4ad7b6ea34eeaf00e94bc9863d18db8ecc3d4d1 100644
--- a/third_party/WebKit/Source/core/fileapi/FileReader.cpp
+++ b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
@@ -196,11 +196,13 @@
 
 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)
@@ -219,7 +221,7 @@
     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)
@@ -469,7 +471,7 @@
 {
     visitor->trace(m_error);
     RefCountedGarbageCollectedEventTargetWithInlineData<FileReader>::trace(visitor);
-    ContextLifecycleObserver::trace(visitor);
+    ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink