Disable testShouldOverrideUrlLoadingOnCreateWindow

Test is expected to fail until we roll CTS containing this change:
https://android-review.googlesource.com/792536

Bug: 896857
Change-Id: I4a14763088982c6c9a300fd442eb1d4fa0d897be
TBR: aluo@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1289678Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600916}

android_webview/tools/cts_config/expected_failure_on_bot.json

@@ -23,6 +23,12 @@
       "_bug_id": "crbug.com/777393"
     }
   ],
+  "android.webkit.cts.WebViewClientTest": [
+    {
+      "name": "testShouldOverrideUrlLoadingOnCreateWindow",
+      "_bug_id": "crbug.com/896857"
+    }
+  ],
   "android.webkit.cts.WebChromeClientTest": [
     {
       "name": "testOnJsBeforeUnloadIsCalled",