fix(ng-zone) Use instance instead of type

[ciriarte]

I'm getting an undefined error on this line, it looks like we were meant to use the instance instead of the type identifier.

[ciriarte]

@vsavkin My build failed, but it looks like it fails on deprecated ng-zone specs:

Chrome 39.0.2171 (Linux 0.0.0) NgZone long stack trace should produce long stack traces FAILED
    Expected 1 to be greater than 1.
        at /home/travis/build/angular/angular/dist/js/dev/es5/angular2/test/core/zone/ng_zone_DEPRECATED_spec.js:58:70 <- angular2/test/core/zone/ng_zone_DEPRECATED_spec.ts:85:41

This line was affecting our app in > alpha.53 up to beta.0

Please let me know if there's anyone else I should refer this issue to.

[vicb]

You should load the lts script when using long stack traces

[ciriarte]

Makes sense. I'll close my PR before it creates more confusion.

[vicb]

#6008 has more details on what needs to be loaded (note that lts is included in angular2-polyfills.js)

[towa48]

check for long-stack-trace-zone.js

if (enableLongStackTrace && zone.longStackTraceZone) {
    errorHandling = collection_1.StringMapWrapper.merge(zone.longStackTraceZone, { onError: function (e) { ngZone._notifyOnError(this, e); } });
}

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