Breaking Change: Iterator.hasNext is now a getter

The Dart continues their sweep through the Dart libraries, changing methods to getters. Recently, Iterator.hasNext() became Iterator.hasNext.

Florian Loitsch writes:

Starting with r14015 Iterator.hasNext is a getter and not a method anymore.
https://codereview.chromium.org/11230011/diff/8001/lib/core/iterator.dart 

Please adapt your code by removing the parenthesis after hasNext calls:
iterator.hasNext() -> iterator.hasNext

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