[Sheriff] Disable flaky LoadingPredictorWithRedirects2.

Failures:
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-rel/29732

TBR=alexilin@chromium.org

Bug: 1006637
Change-Id: I3122de904ef45f55b464a4da6c5e064f6f9d234f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829712Reviewed-by: Sergey Poromov <poromov@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701195}

chrome/browser/predictors/loading_predictor_browsertest.cc

@@ -1118,8 +1118,9 @@ IN_PROC_BROWSER_TEST_P(LoadingPredictorNetworkIsolationKeyBrowserTest,
 // Checks the opposite of the above test - tests that even when a redirect is
 // predicted, preconnects are still made to the original origin using the
 // correct NetworkIsolationKey.
+// TODO(crbug.com/1006637). Flaky on all platforms.
 IN_PROC_BROWSER_TEST_P(LoadingPredictorNetworkIsolationKeyBrowserTest,
-                       LoadingPredictorWithRedirects2) {
+                       DISABLED_LoadingPredictorWithRedirects2) {
   // Cache the redirect, so the only connections to the tracked server created
   // during navigations should be for preconnects.
   GURL destination_url = preconnecting_test_server()->GetURL("/cachetime");