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This change provides the client-side classes needed to receive and send
geolocation messages. GeolocationFeature sends messages from the client
that either contain a geolocation coordinate or error message. The
GeolocationFeature class handles incoming GeoloationSetInterestLevelMessages
and RequestRefreshMessages.

Other items included:
* Changes device/geolocation/mock_location_provider to use fake_location_provider name
* Moves blimp/client/feature/mock_location_provider into device/geolocation.

BUG=614486

Review-Url: https://codereview.chromium.org/2161223003
Cr-Commit-Position: refs/heads/master@{#414797}