Mark ApplicationBreadcrumbsLoggerTest.MemoryPressure as flaky.

Bug: 1046588
Change-Id: I8f3231aa19f029bb2d94d73490f5f8af221b778c
TBR: michaeldo@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2026372Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#736169}

ios/chrome/browser/crash_report/breadcrumbs/application_breadcrumbs_logger_unittest.mm

@@ -63,7 +63,8 @@ TEST_F(ApplicationBreadcrumbsLoggerTest, SkipInProductHelpUserActions) {
 }
 
 // Tests that memory pressure events are logged by ApplicationBreadcrumbsLogger.
-TEST_F(ApplicationBreadcrumbsLoggerTest, MemoryPressure) {
+// TODO(crbug.com/1046588): This test is flaky.
+TEST_F(ApplicationBreadcrumbsLoggerTest, FLAKY_MemoryPressure) {
   base::MemoryPressureListener::SimulatePressureNotification(
       MemoryPressureLevel::MEMORY_PRESSURE_LEVEL_MODERATE);
   base::MemoryPressureListener::SimulatePressureNotification(