[Web Payment] Enable retry by default.

Intent to Ship:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/JwSN1yEVvnk

Bug: 861704, 967867
Change-Id: I1b58befba0838a6a14762e8846c10c8a4a752ea9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756764
Auto-Submit: Rouslan Solomakhin <rouslan@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690050}

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -1211,7 +1211,7 @@
     },
     {
       name: "PaymentRetry",
-      status: "experimental",
+      status: "stable",
     },
     {
       name: "PerformanceManagerInstrumentation",

third_party/blink/web_tests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -4658,6 +4658,7 @@ interface PaymentResponse : EventTarget
     attribute @@toStringTag
     getter details
     getter methodName
+    getter onpayerdetailchange
     getter payerEmail
     getter payerName
     getter payerPhone
@@ -4666,7 +4667,9 @@ interface PaymentResponse : EventTarget
     getter shippingOption
     method complete
     method constructor
+    method retry
     method toJSON
+    setter onpayerdetailchange
 interface Performance : EventTarget
     attribute @@toStringTag
     getter memory