Fix story disables for browse:chrome:newtab

TBR=sullivan@chromium.org

Bug: 914390
Change-Id: I2cfe83fef58ea0f6c7a123c662ccfd5dd875aa5e
Reviewed-on: https://chromium-review.googlesource.com/c/1394393Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619708}

tools/perf/expectations.config

@@ -253,7 +253,7 @@ crbug.com/903417 [ Win ] system_health.common_desktop/long_running:tools:gmail-f
 crbug.com/911214 [ Win_10 ] system_health.common_desktop/multitab:misc:typical24 [ Skip ]
 
 # Benchmark: system_health.common_mobile
-crbug.com/914390 [ Nexus_5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/914390 [ Nexus_5 ] system_health.common_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/714650 [ Android ] system_health.common_mobile/browse:news:globo [ Skip ]
 crbug.com/787001 [ Android_Webview ] system_health.common_mobile/load:media:soundcloud [ Skip ]
 crbug.com/708300 [ Android ] system_health.common_mobile/browse:shopping:flipkart [ Skip ]
@@ -288,7 +288,7 @@ crbug.com/899887 [ Linux ] system_health.memory_desktop/browse:social:facebook_i
 
 # Benchmark: system_health.memory_mobile
 crbug.com/787001 [ Android_Webview ] system_health.memory_mobile/load:media:soundcloud [ Skip ]
-crbug.com/914390 [ Android_Webview Nexus_5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
+crbug.com/914390 [ Nexus_5 ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]
 crbug.com/714650 [ Android ] system_health.memory_mobile/browse:news:globo [ Skip ]
 crbug.com/819552 [ Nexus_5X ] system_health.memory_mobile/browse:chrome:omnibox [ Skip ]
 crbug.com/867853 [ Nexus_5X ] system_health.memory_mobile/browse:chrome:newtab [ Skip ]