Re: [ServiceWorker] Race when registering multiple service workers for the same scope (#783)

Right. That scenario makes them race. I think we should not invoke Clear Registration when the install fails. The subsequent Update will invoke the Install with a new script or clear it out (in Update steps) if it encounters an error anyway.

So, let's remove Install step 11.4.1.5 and Install step 16.3. WDYT?

/cc @mattto 

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