Reproduction Steps:
1. Open User's project
2. Build for iOS
3. Update GVR pods to 1.60 with CocoaPods
4. Build to iPhone
5. Click on Enable VR (first time, it will be fine)
6. Close the app
7. Hold phone in portrait mode
8. Re-open the app
8. Click on Enable VR again
9. Rotate phone to landscape mode
10. Notice that view is incorrect

Expected Behaviour: Google VR works correctly and it does not depend on the app starting orientation.
Actual Result: Google VR displays view incorrectly if it is started in portrait orientation.

Reproduced on versions: Unity 5.6.0f3, 5.6.1p2, 5.6.1p4, 2017.1.0b10, 2017.2.0a4
Reproduced on devices: iPhone 6 iOS 10.3.1, iPhone 6s iOS 10.2.1, iPhone 6 Plus iOS 8.0