[Payments] Add combobox support to editors.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 0cb8b9e51887730ff677b0c6cdf35156ff7dd50a..c9322e1da2e3b59e853af9d3e0bb9ba8c466793f 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -9148,6 +9148,12 @@ I don't think this site should be blocked!
         <message name="IDS_AUTOFILL_FIELD_LABEL_EXPIRATION_DATE" desc="The label of the Expiration date entry.">
           Expiration date
         </message>
+        <message name="IDS_AUTOFILL_FIELD_LABEL_EXPIRATION_MONTH" desc="The label of the Expiration date entry.">
+          Expiration month
+        </message>
+        <message name="IDS_AUTOFILL_FIELD_LABEL_EXPIRATION_YEAR" desc="The label of the Expiration date entry.">
+          Expiration year
+        </message>
 
         <!-- Extension settings -->
         <message name="IDS_MANAGE_EXTENSIONS_SETTING_WINDOWS_TITLE" desc="Title that appears in the dialogue title bar for manage extensions settings">