Add new mark-non-secure-as options to chrome://flags on iOS

ios/chrome/browser/ios_chrome_flag_descriptions.h

Index: ios/chrome/browser/ios_chrome_flag_descriptions.h
diff --git a/ios/chrome/browser/ios_chrome_flag_descriptions.h b/ios/chrome/browser/ios_chrome_flag_descriptions.h
index 251b7c877234036b601222ef86b9bc0381cf23c3..b1abced2d71b5771a34429b6656af8470bd1d1b8 100644
--- a/ios/chrome/browser/ios_chrome_flag_descriptions.h
+++ b/ios/chrome/browser/ios_chrome_flag_descriptions.h
@@ -20,6 +20,15 @@ extern const char kContextualSearch[];
 // Description for the flag to enable Contextual Search.
 extern const char kContextualSearchDescription[];
 
+// Title, description, and options for the MarkHttpAs setting that controls
+// display of omnibox warnings about non-secure pages.
+extern const char kMarkHttpAsName[];
+extern const char kMarkHttpAsDescription[];
+extern const char kMarkHttpAsDangerous[];
+extern const char kMarkHttpAsNonSecureAfterEditing[];
+extern const char kMarkHttpAsNonSecureWhileIncognito[];
+extern const char kMarkHttpAsNonSecureWhileIncognitoOrEditing[];
+
 // Title for the flag to enable Physical Web in the omnibox.
 extern const char kPhysicalWeb[];