Revert D4450924: Expose StatusBar height on iOS

Differential Revision: D4450924

fbshipit-source-id: a883a7417e85f0a923d5fcc4d5efff75b99c2272

React/Modules/RCTStatusBarManager.m

@@ -132,13 +132,6 @@ RCT_EXPORT_METHOD(setNetworkActivityIndicatorVisible:(BOOL)visible)
   RCTSharedApplication().networkActivityIndicatorVisible = visible;
 }
 
-- (NSDictionary *)constantsToExport
-{
-  return @{
-    @"HEIGHT": @([UIApplication sharedApplication].statusBarFrame.size.height)
-  };
-}
-
 #endif //TARGET_OS_TV
 
 @end