Revert of Reduce ActiveDOMObjects from core/

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

Index: third_party/WebKit/Source/core/streams/ReadableStreamReader.h
diff --git a/third_party/WebKit/Source/core/streams/ReadableStreamReader.h b/third_party/WebKit/Source/core/streams/ReadableStreamReader.h
index d743af1391064600ae29bb211be28bd52bc69fba..8bd5f2c490211dfb440605c3945c569457532e46 100644
--- a/third_party/WebKit/Source/core/streams/ReadableStreamReader.h
+++ b/third_party/WebKit/Source/core/streams/ReadableStreamReader.h
@@ -11,7 +11,7 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "bindings/core/v8/ToV8.h"
 #include "core/CoreExport.h"
-#include "core/dom/ContextLifecycleObserver.h"
+#include "core/dom/ActiveDOMObject.h"
 #include "core/streams/ReadableStream.h"
 #include "platform/heap/Handle.h"
 
@@ -24,7 +24,7 @@
 
 // ReadableStreamReader corresponds to the same-name class in the Streams spec
 // https://streams.spec.whatwg.org/.
-class CORE_EXPORT ReadableStreamReader final : public GarbageCollectedFinalized<ReadableStreamReader>, public ScriptWrappable, public ContextLifecycleObserver {
+class CORE_EXPORT ReadableStreamReader final : public GarbageCollectedFinalized<ReadableStreamReader>, public ScriptWrappable, public ActiveDOMObject {
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ReadableStreamReader);
 public:
@@ -42,7 +42,7 @@
     void error();
 
     bool hasPendingActivity() const override;
-    void contextDestroyed() override;
+    void stop() override;
 
     DECLARE_TRACE();