Summary:
Accessing the `responseText` property when `responseType` is not `''` or `'text'` should throw. Also, the property is read-only.
**Test Plan:** UIExplorer example, unit tests
Closes https://github.com/facebook/react-native/pull/7284
Differential Revision: D3366893
fbshipit-source-id: a4cf5ebabcd1e03d6e2dc9d51230982922746c11
Summary: Updated networking and geolocation to use the new events system.
Reviewed By: bestander
Differential Revision: D3346129
fbshipit-source-id: 957716e54d7af8c4a6783f684098e92e92f19654
Summary: Updated networking and geolocation to use the new events system.
Reviewed By: javache
Differential Revision: D3339945
fbshipit-source-id: 01d307cf8a0aea3a404c87c6205132c42290abb1
Summary: Updated networking and geolocation to use the new events system.
Reviewed By: javache
Differential Revision: D3339945
fbshipit-source-id: f1332fb2aab8560e4783739e223c1f31d583cfcf
