[Web Payments] Should set stop propagation flag.

third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp

Index: third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp b/third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp
index 34f1fb19610d0fe174c1eeca06183ff07eb68a1a..1b63d6e878198d176196a857ffddde902229d21e 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequestUpdateEvent.cpp
@@ -116,6 +116,7 @@ void PaymentRequestUpdateEvent::updateWith(ScriptState* scriptState,
     return;
   }
 
+  stopPropagation();
   stopImmediatePropagation();
   m_waitForUpdate = true;
   m_abortTimer.stop();