Remove the iOS QR Code scanner experiment code.

ios/chrome/app/application_delegate/user_activity_handler.mm

Index: ios/chrome/app/application_delegate/user_activity_handler.mm
diff --git a/ios/chrome/app/application_delegate/user_activity_handler.mm b/ios/chrome/app/application_delegate/user_activity_handler.mm
index 5d6a99096188cadffde139bda17f945f4d289e65..3c58815e9a7231f74748606c8f443ee1f97fd373 100644
--- a/ios/chrome/app/application_delegate/user_activity_handler.mm
+++ b/ios/chrome/app/application_delegate/user_activity_handler.mm
@@ -281,11 +281,9 @@ NSString* const kShortcutQRScanner = @"OpenQRScanner";
     return YES;
 
   } else if ([shortcutItem.type isEqualToString:kShortcutQRScanner]) {
-    if (experimental_flags::IsQRCodeReaderEnabled()) {
-      base::RecordAction(
-          UserMetricsAction("ApplicationShortcut.ScanQRCodePressed"));
-      [startupParams setLaunchQRScanner:YES];
-    }
+    base::RecordAction(
+        UserMetricsAction("ApplicationShortcut.ScanQRCodePressed"));
+    [startupParams setLaunchQRScanner:YES];
     [startupInformation setStartupParameters:startupParams];
     return YES;
   }