Revert "Clean up kAutofillCreditCardBankNameDisplay flag"

This reverts commit e363dc219abb57a818406fffcad3bb30555dab4c.

Reason for revert: Not convinced metrics are good; performing flag holdback

Original change's description:
> Clean up kAutofillCreditCardBankNameDisplay flag
>
> Bug: 812710
> Change-Id: I4344c258668c5017a0a145e487ca2eb526bd49bc
> Reviewed-on: https://chromium-review.googlesource.com/923281
> Reviewed-by: Sebastien Seguin-Gagnon <[email protected]>
> Reviewed-by: Robert Kaplow <[email protected]>
> Commit-Queue: Jared Saul <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#537368}

[email protected],[email protected],[email protected],[email protected]

Bug: 812710
Change-Id: I0f15c86af76e686ef4ab55a0313831461503d758
Reviewed-on: https://chromium-review.googlesource.com/974342
Reviewed-by: Mathieu Perreault <[email protected]>
Reviewed-by: Alexei Svitkine <[email protected]>
Reviewed-by: Jared Saul <[email protected]>
Commit-Queue: Jared Saul <[email protected]>
Cr-Commit-Position: refs/heads/master@{#545544}
diff --git a/chrome/browser/flag_descriptions.h b/chrome/browser/flag_descriptions.h
index 3615ab7..dce2f40 100644
--- a/chrome/browser/flag_descriptions.h
+++ b/chrome/browser/flag_descriptions.h
@@ -194,6 +194,9 @@
 extern const char kEnableAutofillCreditCardAblationExperimentDisplayName[];
 extern const char kEnableAutofillCreditCardAblationExperimentDescription[];
 
+extern const char kEnableAutofillCreditCardBankNameDisplayName[];
+extern const char kEnableAutofillCreditCardBankNameDisplayDescription[];
+
 extern const char kEnableAutofillCreditCardLastUsedDateDisplayName[];
 extern const char kEnableAutofillCreditCardLastUsedDateDisplayDescription[];