Disable flaky test AutoPictureInPictureNotTriggeredOnPageShownIfNoAttribute

Bug: 1140960
Change-Id: Ib33835d9da6777599ef0ab1515a8cf6465e8cdd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640393Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Wojciech Dzierżanowski <wdzierzanowski@opera.com>
Cr-Commit-Position: refs/heads/master@{#845351}

chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc

@@ -2442,9 +2442,10 @@ IN_PROC_BROWSER_TEST_F(
 
 // Check that video does not leave Picture-in-Picture automatically when it
 // doesn't have the Auto Picture-in-Picture attribute set.
+// Flaky, see crbug.com/1140960.
 IN_PROC_BROWSER_TEST_F(
     WebAppPictureInPictureWindowControllerBrowserTest,
-    AutoPictureInPictureNotTriggeredOnPageShownIfNoAttribute) {
+    DISABLED_AutoPictureInPictureNotTriggeredOnPageShownIfNoAttribute) {
   InstallAndLaunchPWA(main_url());
   bool result = false;
   ASSERT_TRUE(content::ExecuteScriptAndExtractBool(web_contents(),