[TIMOB-17374] iOS: Stop messing with contentView bounds/frames

Fixes [TIMOB-17374](https://jira.appcelerator.org/browse/TIMOB-17374)
Regress against 
[TIMOB-3600](https://jira.appcelerator.org/browse/TIMOB-3600)
[TIMOB-15396](https://jira.appcelerator.org/browse/TIMOB-15396)
Kitchen Sink

Test against iOS 6,7 & 8 on both iPhone and iPad idioms