Revert of Reduce ActiveDOMObjects from core/

third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp

Index: third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp
diff --git a/third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp b/third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp
index 9c24a0c3cd4d2a4c9138898247ed1bab639219ec..987c3a0e447f4ad6d8e6c9945c4608cb017a4307 100644
--- a/third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp
+++ b/third_party/WebKit/Source/core/streams/ReadableStreamReader.cpp
@@ -15,10 +15,11 @@
 namespace blink {
 
 ReadableStreamReader::ReadableStreamReader(ExecutionContext* executionContext, ReadableStream* stream)
-    : ContextLifecycleObserver(executionContext)
+    : ActiveDOMObject(executionContext)
     , m_stream(stream)
     , m_closed(new ClosedPromise(executionContext, this, ClosedPromise::Closed))
 {
+    suspendIfNeeded();
     ASSERT(m_stream->isLockedTo(nullptr));
     m_stream->setReader(this);
 
@@ -109,19 +110,20 @@
     return isActive() && m_stream->stateInternal() == ReadableStream::Readable;
 }
 
-void ReadableStreamReader::contextDestroyed()
+void ReadableStreamReader::stop()
 {
     if (isActive()) {
         // Calling |error| will release the lock.
         m_stream->error(DOMException::create(AbortError, "The frame stops working."));
     }
+    ActiveDOMObject::stop();
 }
 
 DEFINE_TRACE(ReadableStreamReader)
 {
     visitor->trace(m_stream);
     visitor->trace(m_closed);
-    ContextLifecycleObserver::trace(visitor);
+    ActiveDOMObject::trace(visitor);
 }
 
 } // namespace blink