(ios): fix regression in 2706f34 (apache#715)

Fix merging issue from apache#656

Closes apache#714

Author: NiklasMerz

src/ios/CDVWKInAppBrowser.m

@@ -1244,15 +1244,6 @@ - (UIInterfaceOrientationMask)supportedInterfaceOrientations
     return 1 << UIInterfaceOrientationPortrait;
 }
 
-- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
-{
-    if ((self.orientationDelegate != nil) && [self.orientationDelegate respondsToSelector:@selector(shouldAutorotateToInterfaceOrientation:)]) {
-        return [self.orientationDelegate shouldAutorotateToInterfaceOrientation:interfaceOrientation];
-    }
-    
-    return YES;
-}
-
 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
 {
     [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context)