BREAKING CHANGE: Location#platformStrategy property was previously accidentaly exported as public
If any application requires access to the current location strategy, it should be accessed via DI instead
by injecting the LocationStrategy token.
The likelyhood of anyone actually depending on this property is very low.
Make sure the same path is not added multiple times to the history.
It is replacing the state, instead of skipping it completely,
because the current path in the browser might not be normalized,
while the given one is normalized.
Closes#7829Closes#7897
