Disable flaky test: *NetworkIsolationKeyReusedForBackNavigation*

TBR=avi@chromium.org

Bug: 1024033

Change-Id: I257af8db8aa8951486c69bfe02078a0da303ee51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913123
Auto-Submit: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Yao Xiao <yaoxia@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715065}

chrome/browser/tab_contents/view_source_browsertest.cc

@@ -531,13 +531,10 @@ using ViewSourceWithSplitCacheEnabledTest = ViewSourceWithSplitCacheTest;
 // In the end, the test checks whether the back navigation request resource
 // exists in the cache. |exists_in_cache == true| implies the top_frame_origin
 // of the network isolation key is a.com (reused).
+//
+// Flaky. http://crbug.com/1024033
 IN_PROC_BROWSER_TEST_P(ViewSourceWithSplitCacheEnabledTest,
-                       NetworkIsolationKeyReusedForBackNavigation) {
-  if (!GetParam()) {
-    // Flaky in /0 variant: https://crbug.com/1024033.
-    return;
-  }
-
+                       DISABLED_NetworkIsolationKeyReusedForBackNavigation) {
   content::SetupCrossSiteRedirector(embedded_test_server());
   ASSERT_TRUE(embedded_test_server()->Start());