Disable test: PaymentRequestInitiatedCompletionStatusMetricsTest.Aborted_NotShown

TBR=rouslan@chromium.org

No-Try: true
Bug: 1003253
Change-Id: I87fbae4f1faed1f1ecc94da0b572cba235ad628b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1800136Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Makoto Shimazu <shimazu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695960}

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

@@ -496,8 +496,9 @@ IN_PROC_BROWSER_TEST_F(PaymentRequestCompletionStatusMetricsTest,
 using PaymentRequestInitiatedCompletionStatusMetricsTest =
     PaymentRequestBrowserTestBase;
 
+// Disabled due to flakiness: https://crbug.com/1003253.
 IN_PROC_BROWSER_TEST_F(PaymentRequestInitiatedCompletionStatusMetricsTest,
-                       Aborted_NotShown) {
+                       DISABLED_Aborted_NotShown) {
   base::HistogramTester histogram_tester;
   NavigateTo("/initiated_test.html");