[Perf] Disable v8.browsing_mobile-future.

Disables v8.browsing_mobile-future to free up capacity and enable us to update the
mobile system_health stories to 2019. Once the 2016 versions are removed, we can
re-enable this benchmark.

BUG=chromium:878390

Change-Id: I32071bec5f1ce4fc75dfe4fe42ddf6c04397c4cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813327
Auto-Submit: Ross McIlroy <rmcilroy@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698850}

tools/perf/expectations.config

@@ -433,6 +433,9 @@ crbug.com/1002640 [ android-pixel-2 ] v8.browsing_mobile/browse:chrome:newtab [
 crbug.com/1002665 [ android-pixel-2 ] v8.browsing_mobile/browse:chrome:omnibox [ Skip ]
 
 # Benchmark: v8.browsing_mobile-future
+# Disabled v8.browsing_mobile-future for capacity reasons while we update
+# mobile benchmarks to 2019. Re-enable once the original benchmarks are removed.
+crbug.com/878390 [ android ] v8.browsing_mobile-future/* [ Skip ]
 crbug.com/714650 [ android ] v8.browsing_mobile-future/browse:news:globo [ Skip ]
 crbug.com/803465 [ android-nexus-5 ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]
 crbug.com/910207 [ android-nexus-5x ] v8.browsing_mobile-future/browse:chrome:newtab [ Skip ]