Disable failing v8.browsing_desktop stories (pinterest 2018, maps)

NOTRY=true
TBR=ulan@chromium.org, mythria@chromium.org

Bug: 954959
Change-Id: I685f32972feec1f2f0fc183babf56ebb808669c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1577559Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652849}

tools/perf/expectations.config

@@ -350,6 +350,8 @@ crbug.com/875159 [ Win_10 ] v8.browsing_desktop/browse:social:facebook_infinite_
 crbug.com/875159 [ Win_10 ] v8.browsing_desktop/browse:media:imgur [ Skip ]
 crbug.com/875159 [ Win_10 ] v8.browsing_desktop/browse:media:tumblr [ Skip ]
 crbug.com/953371 [ Win ] v8.browsing_desktop/browse:social:twitter_infinite_scroll:2018 [ Skip ]
+crbug.com/954959 [ Linux ] v8.browsing_desktop/browse:media:pinterest:2018 [ Skip ]
+crbug.com/954959 [ Linux ] v8.browsing_desktop/browse:tools:maps [ Skip ]
 
 # Benchmark v8.browsing_desktop-future
 crbug.com/788796 [ Linux ] v8.browsing_desktop-future/browse:media:imgur [ Skip ]