Hixie 9da399b0e1 Rationalise usage of keys in navigator.dart.
Route (named routes) no longer have a key, and have their own storage for their names.
RouseState no longer has a key, and uses an owner field pointing to a StatefulComponent instead.
As such, RouteBase no longer has a key.

HistoryEntry no longer uses a global int to ensure uniqueness.

Propagated this to stocks app.
2015-07-21 14:58:48 -07:00
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