Disable system_health.memory_desktop/browse:media:tumblr on Linux

TBR=perezju@chromium.org
NOTRY=true

Bug: 812807
Change-Id: If6797e1cf2ad7d3dd776570072294e62593ae70d
Reviewed-on: https://chromium-review.googlesource.com/922922Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537272}

tools/perf/expectations.config

@@ -242,6 +242,7 @@ crbug.com/673775 [ Win ] system_health.memory_desktop/browse:search:google [ Ski
 crbug.com/664661 [ Mac ] system_health.memory_desktop/load:games:miniclip [ Skip ]
 crbug.com/728464 [ All ] system_health.memory_desktop/browse:social:twitter_infinite_scroll [ Skip ]
 crbug.com/799106 [ Win ] system_health.memory_desktop/browse:media:flickr_infinite_scroll [ Skip ]
+crbug.com/812807 [ Linux ] system_health.memory_desktop/browse:media:tumblr [ Skip ]
 
 # Benchmark: system_health.memory_mobile
 crbug.com/787001 [ Android_Webview ] system_health.memory_mobile/load:media:soundcloud [ Skip ]