Re: [slightlyoff/ServiceWorker] Never fail for navigation requests (#892)

Step 18.6.1 of Handle Fetch aborts the the task steps if a runtime script error occurs:

```
 5) Dispatch e at activeWorker’s environment settings object’s global object.
 6) For each event listener invoked:
    1) If any uncaught runtime script error occurs, then:
        1) Report the error for the script per the runtime script errors handling.
        2) Abort these steps. 
```

It then says after step 18.6:

> If task is discarded or the script has been aborted by the termination of activeWorker, set handleFetchFailed to true.

I believe previously the spec used the term "aborted" there instead of "task is discarded", but I think it applies.

if `handleFetchFailed` is true then we return a network error in step 21.

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