Summary:
This make the transform behave closer to the standard for modules.
This removes the few places that a top level this was used to refer to the global space. It also clean up the usage of `GLOBAL` to use `global` instead as this is what is used everywhere else in the code base. We still define `GLOBAL` for compatibility with other modules.
**Test plan**
Clear the packager cache to make sure the transforms run again. (node ./local-cli/cli.js start --reset-cache).
Run the Movies example (UIExplorer is broken atm) and make sure there are no errors.
Closes https://github.com/facebook/react-native/pull/6255
Differential Revision: D3037227
Pulled By: mkonicek
fb-gh-sync-id: bcf1350ae7a6e92c77d3a87fc9d6e42eb93cb9b9
fbshipit-source-id: bcf1350ae7a6e92c77d3a87fc9d6e42eb93cb9b9
169cfb5a52