IndexedDB: Align abort behavior on uncaught exception with Gecko

third_party/WebKit/Source/modules/indexeddb/IDBRequest.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
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   // New state is not applied to the cursor object until the event is
   // dispatched.
   Member<IDBKey> m_cursorKey;
   Member<IDBKey> m_cursorPrimaryKey;
   RefPtr<IDBValue> m_cursorValue;
 
   bool m_didFireUpgradeNeededEvent = false;
   bool m_preventPropagation = false;
   bool m_resultDirty = true;
 
+  // Transactions should be aborted after event dispatch if an exception was
+  // not caught. This is cleared before dispatch, set by a call to
+  // uncaughtExceptionInEventHandler() during dispatch, and checked afterwards
+  // to abort if necessary.
+  bool m_didThrowInEventHandler = false;
+
   // Pointer back to the WebIDBCallbacks that holds a persistent reference to
   // this object.
   WebIDBCallbacks* m_webCallbacks = nullptr;
 };
 
 }  // namespace blink
 
 #endif  // IDBRequest_h