Yedidya Kennard 55c8158c44 Corrected bug that put the UTI instead of mimeType in retrieved assets
Summary:
This pull request corrects a bug  found in `RCTAssetsLibraryRequestHandler` which used the asset UTI as the mimeType.

The code for finding the mimeType is based on the implementation used in `RCTImageLoader` and `RCTImageUtils`.
Closes https://github.com/facebook/react-native/pull/7349

Differential Revision: D3252796

Pulled By: nicklockwood

fb-gh-sync-id: b9303a99333e4744dfe23045f4a2755307305772
fbshipit-source-id: b9303a99333e4744dfe23045f4a2755307305772
2016-05-03 08:53:34 -07:00
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