[Telemetry] Disable mojo loading stories using new test expectations config file

Bug: 781409
Change-Id: I7d41a7ef52df506c6cb11f8c19051a0f5c63f500
Reviewed-on: https://chromium-review.googlesource.com/820812
Commit-Queue: rnephew <rnephew@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#523289}

tools/perf/expectations.config

@@ -4,6 +4,12 @@
 # tags: ChromeOS Android Desktop Mobile Nexus_5 Nexus_5X Nexus_6 Nexus_6P
 # tags: Nexus_7 Cherry_Mobile_Android_One Mac_10.11 Mac_10.12 Nexus6_Webview
 # tags: Nexus5X_Webview
+
 # Benchmark: loading.desktop
 crbug.com/723783 [ Win ] loading.desktop/Orange [ Skip ]
 crbug.com/752611 [ Linux ] loading.desktop/uol.com.br [ Skip ]
+
+##### Perf FYI benchmarks go after here #####
+# Benchmark: loading.desktop.network_service
+crbug.com/723783 [ Win ] loading.desktop.network_service/Orange [ Skip ]
+crbug.com/752611 [ Linux ] loading.desktop.network_service/uol.com.br [ Skip ]