Register custodian obfuscated gaia id pref.

This was mistakenly omitted from https://crrev.com/658192

Bug: 957832
Change-Id: I735dfee7d44e771b42e34503e69a67a81d8061e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1617209
Commit-Queue: Danan S <danan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661053}

chrome/browser/supervised_user/supervised_user_service.cc

@@ -87,14 +87,16 @@ const char kBlacklistURL[] =
 const char kBlacklistFilename[] = "su-blacklist.bin";
 
 const char* const kCustodianInfoPrefs[] = {
-  prefs::kSupervisedUserCustodianName,
-  prefs::kSupervisedUserCustodianEmail,
-  prefs::kSupervisedUserCustodianProfileImageURL,
-  prefs::kSupervisedUserCustodianProfileURL,
-  prefs::kSupervisedUserSecondCustodianName,
-  prefs::kSupervisedUserSecondCustodianEmail,
-  prefs::kSupervisedUserSecondCustodianProfileImageURL,
-  prefs::kSupervisedUserSecondCustodianProfileURL,
+    prefs::kSupervisedUserCustodianName,
+    prefs::kSupervisedUserCustodianEmail,
+    prefs::kSupervisedUserCustodianObfuscatedGaiaId,
+    prefs::kSupervisedUserCustodianProfileImageURL,
+    prefs::kSupervisedUserCustodianProfileURL,
+    prefs::kSupervisedUserSecondCustodianName,
+    prefs::kSupervisedUserSecondCustodianEmail,
+    prefs::kSupervisedUserSecondCustodianObfuscatedGaiaId,
+    prefs::kSupervisedUserSecondCustodianProfileImageURL,
+    prefs::kSupervisedUserSecondCustodianProfileURL,
 };
 
 void CreateURLAccessRequest(const GURL& url,