sheriff: disable HandleMediaKeyPlayPause

TBR=jrw@chromium.org

Bug: 1156754
Change-Id: I85af0e5b94b65be15392329d3fc11831530dac67
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2579724Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Commit-Queue: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834828}

chrome/browser/picture_in_picture/picture_in_picture_window_controller_browsertest.cc

@@ -1557,8 +1557,9 @@ IN_PROC_BROWSER_TEST_F(PictureInPictureWindowControllerBrowserTest,
 // Tests that video in Picture-in-Picture is paused when user presses
 // VKEY_MEDIA_PLAY_PAUSE key even if there's another media playing in a
 // foreground tab.
+// Flaky, see crbug.com/1156754
 IN_PROC_BROWSER_TEST_F(PictureInPictureWindowControllerBrowserTest,
-                       HandleMediaKeyPlayPause) {
+                       DISABLED_HandleMediaKeyPlayPause) {
   GURL test_page_url = ui_test_utils::GetTestUrl(
       base::FilePath(base::FilePath::kCurrentDirectory),
       base::FilePath(kPictureInPictureWindowSizePage));