[Code Health][iOS] Move ios/c/b/iph_for_new_chrome_user to model subfolder

To simplify the folder hierarchy on iOS and have a clearer layer
separation, all the files in ios/c/b/<foo>/ will be moved to
ios/c/b/<foo>/model/ to showcase that they are model files.

Bug: 1480312
Change-Id: I763494c1435aad83d99b094f422f0208028703a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4951166
Code-Coverage: [email protected] <[email protected]>
Reviewed-by: Sylvain Defresne <[email protected]>
Commit-Queue: Ali Juma <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1212119}
diff --git a/ios/chrome/browser/flags/about_flags.mm b/ios/chrome/browser/flags/about_flags.mm
index 1dad4d0c..753ee4b 100644
--- a/ios/chrome/browser/flags/about_flags.mm
+++ b/ios/chrome/browser/flags/about_flags.mm
@@ -78,7 +78,7 @@
 #import "ios/chrome/browser/flags/chrome_switches.h"
 #import "ios/chrome/browser/flags/ios_chrome_flag_descriptions.h"
 #import "ios/chrome/browser/follow/follow_features.h"
-#import "ios/chrome/browser/iph_for_new_chrome_user/features.h"
+#import "ios/chrome/browser/iph_for_new_chrome_user/model/features.h"
 #import "ios/chrome/browser/ntp/features.h"
 #import "ios/chrome/browser/ntp/home/features.h"
 #import "ios/chrome/browser/parcel_tracking/parcel_tracking_util.h"