sheriff: disable ScrollBubblingFromOOPIFTest on all platforms

It appears to be flaky on cros, windows, and linux, and I think it
doesn't run at all on Mac, so disabling it everywhere.

Bug: 1148741
Change-Id: Ife041d5685b5d59be422eb6e762e3ceda86d4561
Tbr: liviutinta@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577857Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Liviu Tinta <liviutinta@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834395}

content/browser/site_per_process_browsertest.cc

@@ -1693,7 +1693,9 @@ IN_PROC_BROWSER_TEST_P(SitePerProcessBrowserTest,
 
 // Test that scrolling a nested out-of-process iframe bubbles unused scroll
 // delta to a parent frame.
-IN_PROC_BROWSER_TEST_P(SitePerProcessBrowserTest, ScrollBubblingFromOOPIFTest) {
+// Flaky on all platforms: https://crbug.com/1148741
+IN_PROC_BROWSER_TEST_P(SitePerProcessBrowserTest,
+                       DISABLED_ScrollBubblingFromOOPIFTest) {
   ScrollBubblingProxyObserver scroll_bubbling_proxy_observer;
 
   ui::GestureConfiguration::GetInstance()->set_scroll_debounce_interval_in_ms(