Turn IDBTransaction into the ContextLifecycleObserver it needs to be.

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

 /*
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 38 matching lines @@
 class IDBDatabase;
 class IDBIndex;
 class IDBObjectStore;
 class IDBOpenDBRequest;
 class IDBRequest;
 class ScriptState;
 
 class MODULES_EXPORT IDBTransaction final
     : public EventTargetWithInlineData,
       public ActiveScriptWrappable<IDBTransaction>,
-      public ContextClient {
+      public ContextLifecycleObserver {
   USING_GARBAGE_COLLECTED_MIXIN(IDBTransaction);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static IDBTransaction* createObserver(ExecutionContext*,
                                         int64_t,
                                         const HashSet<String>& scope,
                                         IDBDatabase*);
 
   static IDBTransaction* createNonVersionChange(ScriptState*,
@@ skipping 181 matching lines @@
   // This does not include a snapshot of the database's object store / index
   // metadata.
   //
   // Only valid for versionchange transactions.
   IDBDatabaseMetadata m_oldDatabaseMetadata;
 };
 
 }  // namespace blink
 
 #endif  // IDBTransaction_h