| Index: Source/modules/serviceworkers/ExtendableEvent.idl
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| diff --git a/Source/modules/serviceworkers/ExtendableEvent.idl b/Source/modules/serviceworkers/ExtendableEvent.idl
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| index c6a2b5f31c1c858fd02c831a2da2d3450df5cb08..ea9fbac3418083bda81c49c546653f480bad15dc 100644
 | 
| --- a/Source/modules/serviceworkers/ExtendableEvent.idl
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| +++ b/Source/modules/serviceworkers/ExtendableEvent.idl
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| @@ -32,6 +32,7 @@
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|  [
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|      RuntimeEnabled=ServiceWorker,
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|      Exposed=ServiceWorker,
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| +    TypeChecking=Interface,
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|  ] interface ExtendableEvent : Event {
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|      [CallWith=ScriptState] void waitUntil(any value);
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|  };
 | 
| 
 |