[tools/perf] Disable all system_health.memory_mobile on N5X

Most but not all stories have been disabled due to flakes. The few
remaining ones still flake every now and then.

Better to unconditionally disable all until the root cause is fixed.

TBR=crouleau@chromium.org

Bug: 971674
Bug: 964960
Change-Id: I23c0ffef7250b9140606d103feb2442ab9dab195
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649160Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667077}

tools/perf/expectations.config

@@ -339,50 +339,7 @@ crbug.com/947267 [ Nexus_5X ] system_health.memory_mobile/background:media:imgur
 crbug.com/954949 [ Nexus5X_Webview ] system_health.memory_mobile/browse:news:washingtonpost [ Skip ]
 crbug.com/961417 [ Android_Go ] system_health.memory_mobile/browse:social:tumblr_infinite_scroll:2018 [ Skip ]
 
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:media:flickr_infinite_scroll [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:search:amp:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:games:lazors [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:games:spychase:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:media:flickr:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:news:irctc [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:search:baidu:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:search:google:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:tools:stackoverflow:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/background:search:google [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:media:googleplaystore:2019 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:media:imgur [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:media:facebook_photos [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:media:youtube [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:shopping:lazada [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:tools:maps [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:media:dailymotion [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:news:qq [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:news:wikipedia:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:search:ebay:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:search:taobao [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:tools:dropbox [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/background:social:facebook [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/browse:social:facebook_infinite_scroll:2018 [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/load:media:facebook_photos [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/load:media:google_images:2018 [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/load:media:soundcloud:2018 [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/load:search:yahoo:2018 [ Skip ]
-crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/load:social:twitter [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:news:cricbuzz [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:news:reddit [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:news:qq [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:search:amp:sxg:2019 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:social:instagram [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:social:twitter [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/browse:social:tumblr_infinite_scroll:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:chrome:blank [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:media:imgur:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:media:youtube:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:news:cnn:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:news:reddit [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:search:yandex:2018 [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:tools:docs [ Skip ]
-crbug.com/964804 [ Nexus_5X ] system_health.memory_mobile/load:tools:weather [ Skip ]
+crbug.com/964960 [ Nexus_5X ] system_health.memory_mobile/* [ Skip ]
 
 # Benchmark: tab_switching.typical_25
 crbug.com/747026 [ Mac ] tab_switching.typical_25/multitab:misc:typical24 [ Skip ]