[tools/perf] Disable flaky browse:shopping:avito

Story in v8.browsing_mobile-future is flay on Pixel 2.

NOTRY=true
TBR=nednguyen@google.com

Bug: 865400
Change-Id: I90c2f93787341b19a680a590df370fb978313f32
Reviewed-on: https://chromium-review.googlesource.com/c/1349311Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610567}

tools/perf/expectations.config

@@ -358,6 +358,7 @@ crbug.com/799080 [ Nexus_5X Android_Webview ] v8.browsing_mobile-future/browse:s
 crbug.com/799080 [ Nexus_5X Android_Webview ] v8.browsing_mobile-future/browse:social:facebook [ Skip ]
 crbug.com/875159 [ Win_10 ] v8.browsing_desktop-future/browse:social:facebook_infinite_scroll [ Skip ]
 crbug.com/901534 [ Nexus6_Webview ] v8.browsing_mobile-future/browse:news:toi [ Skip ]
+crbug.com/865400 [ Pixel_2 ] v8.browsing_mobile-future/browse:shopping:avito [ Skip ]
 
 # Benchmark: v8.detached_context_age_in_gc
 crbug.com/770982 [ Win ] v8.detached_context_age_in_gc/Docs_(1_open_document_tab) [ Skip ]