Material Page Info (Views, 1/3): Rename {ChosenObject, PermissionSelector}View classes to {...}Row.
In the near future, these will not be Views of their own, but classes that
manage individual rows in a GridLayout.
Also adds a missing build file entry for `chosen_object_row_observer.h`.
BUG=
512442
Committed:
https://crrev.com/8f0f6cbe0c26ac1f11509984db71e8e344b48baa
Cr-Commit-Position: refs/heads/master@{#416874}