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JiaLiPassion
4a892a3fac
fetch support AbortSignal, zone.js schedules a macroTask when fetch()
```
fetch(..., {signal: abortSignal});
```
we should also be able to cancel fetch with `zoneTask.cancel` call.
So this commit create an internal AbortSignal to handle
`zoneTask.cancel()` call and also delegate the `options.signal` from the
user code.
PR Close #49595