Clean up Google Maps advanced marker

[crisbeto]

Includes a couple of changes:

fix(google-maps): make info window open method compatible with advanced marker

Currently the info window has two methods: one for any MapAnchorPoint and one for an advanced marker. These changes deprecate the latter and make the former compatible with advanced markers.

build: use ngModel in google map demo

Adding new options to the Google Maps demo has been a bit cumbersome, because it's using click handlers on checkboxes to manage the state. These changes switch to using ngModel.

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