[Payments] Don't add expired cards in Payment Request.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
index 26bbd0f448e358b1cf04bbefa9ffad28e0f367e9..abc0d784ec8e17326b9becd49b81c6eed9ca6aa5 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/payments/PaymentRequestImpl.java
@@ -97,6 +97,12 @@ public class PaymentRequestImpl implements PaymentRequest, PaymentRequestUI.Clie
         void onPaymentRequestServiceBillingAddressChangeProcessed();
 
         /**
+         * Called when the controller is notified of an expiration month change, but does not alter
+         * the editor UI.

[please use gerrit instead, 2016/10/27 00:05:22]

"but does not alter the editor UI" on lines 94-95 refers to CardEditor launching
an address editor when user selects "+ add billing address" in the dropdown.
Nothing crazy like this happens for expiration month dropdown, so there's no
need to have that phrasing. You can probably simplify it to "Called when
expiration month changed in credit card editor." You can also remove the
"Processed" part of the method name, because nothing fancy happens when the
dropdown value is changed.

[sebsg, 2016/10/27 14:38:00]

Done.

+         */
+        void onPaymentRequestServiceExpirationMonthChangeProcessed();
+
+        /**
          * Called when a show request failed. This can happen when:
          * <ul>
          *   <li>The merchant requests only unsupported payment methods.</li>