Format expiration month dropdown key format to the stored format in Autofill

chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java
index dbc2c62441c899d1f2f371f3faf3fa145656ba06..38f5aa2c1fb086951a7df5d318c60365bd8839be 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/CardEditor.java
@@ -575,7 +575,7 @@ public class CardEditor extends EditorBase<AutofillPaymentInstrument>
         List<DropdownKeyValue> result = new ArrayList<>();
 
         Locale locale = Locale.getDefault();
-        SimpleDateFormat keyFormatter = new SimpleDateFormat("M", locale);
+        SimpleDateFormat keyFormatter = new SimpleDateFormat("MM", locale);
         SimpleDateFormat valueFormatter = new SimpleDateFormat("MMMM (MM)", locale);
 
         calendar.set(Calendar.DAY_OF_MONTH, 1);