Wer Ka - 2016-03-08

In Method nativeGetModificationDate of Class File is modificationdate used instead of lastModifiedDate.
See https://developer.mozilla.org/en-US/docs/Web/API/File/lastModifiedDate

private native double nativeGetModificationDate() /*-{
    return this.modificationdate != null ? this.modificationdate.getTime() : 0;
}-*/;

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