Adam Ernst b4e267a993 Refactor RCTBundleURLProvider
Summary:
- Avoid using `+initialize`, use dispatch_once instead; it should be equivalent but more performant.
- Don't even let the `isPackagerRunning:` and `guessPackagerHost` methods exist unless `RCT_DEV` is on; they didn't do anything interesting when it is off.

Reviewed By: javache

Differential Revision: D3556645

fbshipit-source-id: 7dcdb4ae27f6625010e15846d757269f6f04155c
2016-07-13 16:43:38 -07:00
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