Disable LitePagePreviewsOriginProbe_ExternalFailureReported/*

Already disabled on WIN/MAC/CHROMEOS, these tests have been heavily
flaky on various linux bots. This change fully disables these tests (a
subset of the PreviewsLitePageRedirectServerTimeoutBrowserTests).

TBR=tbansal@chromium.org
BUG=1024824

Change-Id: I686c928b085677c267fc8298e6f9e756ad32bcff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919802Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715891}

chrome/browser/previews/previews_lite_page_redirect_browsertest.cc

@@ -1722,10 +1722,12 @@ IN_PROC_BROWSER_TEST_P(PreviewsLitePageRedirectServerTimeoutBrowserTest,
   }
 }
 
+// Disabled previously on WIN/MAC/CHROMEOS, flakiness still occurred on various
+// linux bots, so this test is now fully disabled due to that flakiness. See
+// https://crbug.com/1024824.
 IN_PROC_BROWSER_TEST_P(
     PreviewsLitePageRedirectServerTimeoutBrowserTest,
-    DISABLE_ON_WIN_MAC_CHROMEOS(
-        LitePagePreviewsOriginProbe_ExternalFailureReported)) {
+    DISABLED_LitePagePreviewsOriginProbe_ExternalFailureReported) {
   set_origin_probe_success(true);
 
   base::HistogramTester histogram_tester;