Use invalid value for GetAccessPointName for CHROME_IOS_RESERVED

rlz/lib/lib_values.cc

Index: rlz/lib/lib_values.cc
diff --git a/rlz/lib/lib_values.cc b/rlz/lib/lib_values.cc
index 06113a8fc9277a0ef821e2de7a71e890899c4083..80e987af23b2189de2aac66ac9baaf5994b862e3 100644
--- a/rlz/lib/lib_values.cc
+++ b/rlz/lib/lib_values.cc
@@ -99,7 +99,10 @@ const char* GetAccessPointName(AccessPoint point) {
   case CHROMEOS_HOME_PAGE:            return "CB";
   case CHROMEOS_APP_LIST:             return "CC";
   case CHROME_IOS_OMNIBOX:            return "C9";
-  case CHROME_IOS_RESERVED:           return "C0";
+  // Returns an invalid access point value here as this value does not
+  // correspond to a defined access point, but need to be defined for
+  // code that iterates over all values of rlz_lib::AccessPoint.
+  case CHROME_IOS_RESERVED:           return "__";
   case CHROME_APP_LIST:               return "C7";
   case CHROME_MAC_APP_LIST:           return "C8";
   case UNDEFINED_AP_Q:                return "RQ";