Disabled flaky test ChildFrameCrashMetrics_KilledWhileHiddenThenShown

TBR=arthursonzogni@chromium.org

Bug: 1097060
Change-Id: Ic873cfd8030d8ef0b25604b638edd895355353be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252808Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780288}

content/browser/site_per_process_browsertest.cc

@@ -13324,8 +13324,10 @@ IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
   histograms.ExpectTotalCount("Stability.ChildFrameCrash.Visibility", 0);
 }
 
-IN_PROC_BROWSER_TEST_F(SitePerProcessBrowserTest,
-                       ChildFrameCrashMetrics_KilledWhileHiddenThenShown) {
+// Test is flaky (crbug.com/1097060)
+IN_PROC_BROWSER_TEST_F(
+    SitePerProcessBrowserTest,
+    DISABLED_ChildFrameCrashMetrics_KilledWhileHiddenThenShown) {
   // Set-up a frame tree that helps verify what the metrics tracks:
   // 1) frames (12 frames are affected if B process gets killed) or
   // 2) widgets (10 b widgets and 1 c widget are affected if B is killed) or