Disable a flaky PaymentRequestShowPromiseTest.

PaymentRequestShowPromiseTest.UnsupportedPaymentMethod is flaky.

Bug: 1116607
Change-Id: I0dc2d92a09e3bf3ed94bfe69b34a949fac36cbbf
Tbr: rouslan@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357753Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798315}

chrome/browser/ui/views/payments/payment_request_show_promise_browsertest.cc

@@ -284,8 +284,9 @@ IN_PROC_BROWSER_TEST_F(PaymentRequestShowPromiseTest, Timeout) {
   ExpectBodyContains({R"(AbortError)"});
 }
 
+// Disabled for being flaky. crbug.com/1116607
 IN_PROC_BROWSER_TEST_F(PaymentRequestShowPromiseTest,
-                       UnsupportedPaymentMethod) {
+                       DISABLED_UnsupportedPaymentMethod) {
   NavigateTo("/show_promise/unsupported.html");
   ResetEventWaiterForSequence(
       {DialogEvent::PROCESSING_SPINNER_SHOWN,