Summary: This PR bumps fetch to 0.9.0, the latest release and fixes broken feature detection originating in that self is not referring to `window.self` but an empty object. Assigning that object to window.self or GLOBAL won't work in the chrome dev tools because of CORS restrictions. This is a pragmatic solution but maybe not ideal.
Background to the problem can be read here: https://github.com/facebook/react-native/issues/2376
Closes https://github.com/facebook/react-native/pull/2587
Reviewed By: @trunkagent, @svcscm
Differential Revision: D2438341
Pulled By: @vjeux