[ios] Use constraints to manage ornament view placement (again) (#9995)

This reverts the manual layout triggered by KVO approach in favor of a constraints based approach that the KVO method had previously replaced. Although the manual layout approach worked well in most cases and was cleaner in that it did not manipulate any containing views in the app space, using KVO on UIViewControllers has proven to be dangerous.

This also updates the gitshas for KIF and OHHTTPStubs to unbreak UI tests that verify these related changes are working.

This also adds an ornament constraint system for iOS 11+

1 files changed, 0 insertions, 0 deletions

diff --git a/platform/ios/uitest/OHHTTPStubs b/platform/ios/uitest/OHHTTPStubs
-Subproject deed01a1592210a4c37f3f5c5f2b32fe0e41c60
+Subproject 4dc6f36375f78c0b3cfe58d90bb8a4e21df5196