IDBObserver does not need to be GC finalizable.

third_party/WebKit/Source/modules/indexeddb/IDBObserver.h

Index: third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h b/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
index bcfdee7e82637f61ea53b7873716e6002147bb43..2b61db8ed728e29ce74657abb9379ddafbee6b3a 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
@@ -21,9 +21,8 @@ class IDBObserverInit;
 class IDBTransaction;
 struct WebIDBObservation;
 
-class MODULES_EXPORT IDBObserver final
-    : public GarbageCollectedFinalized<IDBObserver>,
-      public ScriptWrappable {
+class MODULES_EXPORT IDBObserver final : public GarbageCollected<IDBObserver>,
+                                         public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
@@ -44,7 +43,7 @@ class MODULES_EXPORT IDBObserver final
   DECLARE_TRACE();
 
  private:
-  IDBObserver(IDBObserverCallback*);
+  explicit IDBObserver(IDBObserverCallback*);
 
   Member<IDBObserverCallback> m_callback;
   HeapHashMap<int32_t, WeakMember<IDBDatabase>> m_observerIds;