[Payments] Basic validation in the credit card editor.

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 6b08a1fe9908c005d44621419a6a62b377629217..2bdd4234c6335daff0fe5f34c2de85006e09c261 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -9486,10 +9486,10 @@ I don't think this site should be blocked!
       </message>
 
       <!-- Autofill dialog: field labels. -->
-      <message name="IDS_AUTOFILL_DIALOG_PLACEHOLDER_EXPIRY_MONTH" desc="The placeholder/label text for credit card expiration month in the requestAutocomplete dialog.">
+      <message name="IDS_AUTOFILL_DIALOG_PLACEHOLDER_EXPIRY_MONTH" desc="The placeholder/label text for credit card expiration month in the card unmask dialog.">
         Month
       </message>
-      <message name="IDS_AUTOFILL_DIALOG_PLACEHOLDER_EXPIRY_YEAR" desc="The placeholder/label text for credit card expiration year in the requestAutocomplete dialog.">
+      <message name="IDS_AUTOFILL_DIALOG_PLACEHOLDER_EXPIRY_YEAR" desc="The placeholder/label text for credit card expiration year in the card unmask dialog.">
         Year
       </message>
       <message name="IDS_AUTOFILL_FROM_GOOGLE_ACCOUNT" desc="The name of the Google product that stores user addresses or credit cards in the cloud." formatter_data="android_java">