Re: [ServiceWorker] importScripts() should throw? (#642)

I think should not applicable now, since the `importScripts` built-in function has a legacy behavior since Web Worker and Shared Worker specifications also support it.

IMO exceptions are a layer on control-flow which is too much overloaded and abused in general, and in JavaScript engines are not too much optimized.
As it's sync, maybe returning a `boolean` could be fine as well, but in the future it will not be able to support ES6 module `import` behavior as `return`

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