Disable SingleClientSessionsSyncTest.NavigationChainAlteredDestructively

It's flaky, mostly on Windows but also on other platforms.

Bug: 1043899
Change-Id: I218ce343f68be745a349c187fe1da16d75da978f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022650
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735427}

chrome/browser/sync/test/integration/single_client_sessions_sync_test.cc

@@ -590,8 +590,10 @@ IN_PROC_BROWSER_TEST_F(SingleClientSessionsSyncTest,
   ExpectNavigationChain({first_url, second_url});
 }
 
+// Flaky for reasons that likely have nothing to do with the test itself. See
+// crbug.com/1043899 and crbug.com/992207.
 IN_PROC_BROWSER_TEST_F(SingleClientSessionsSyncTest,
-                       NavigationChainAlteredDestructively) {
+                       DISABLED_NavigationChainAlteredDestructively) {
   ASSERT_TRUE(SetupSync()) << "SetupSync() failed.";
   ASSERT_TRUE(CheckInitialState(0));