Reenable nytimes and spychase on Android

Based on a try job in the linked bug, it looks like these stories are
no longer failing.

TBR=sullivan@chromium.org

Bug: 798536
Change-Id: I44a6d819fa0fea6dc71b76d0189933b9009d3c78
Reviewed-on: https://chromium-review.googlesource.com/1143450Reviewed-by: Charlie Andrews <charliea@chromium.org>
Commit-Queue: Charlie Andrews <charliea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577533}

tools/perf/expectations.config

@@ -255,8 +255,6 @@ crbug.com/865471 [ Android_Webview ] system_health.common_mobile/browse:chrome:n
 crbug.com/738854 [ Nexus_5X ] system_health.common_mobile/load:tools:drive [ Skip ]
 crbug.com/738854 [ Android_Webview ] system_health.common_mobile/load:tools:drive [ Skip ]
 crbug.com/797261 [ Android_Webview ] system_health.common_mobile/load:games:spychase [ Skip ]
-crbug.com/798536 [ Android ] system_health.common_mobile/background:news:nytimes [ Skip ]
-crbug.com/798536 [ Android ] system_health.common_mobile/load:games:spychase [ Skip ]
 crbug.com/736147 [ Android_One ] system_health.common_mobile/browse:social:tumblr_infinite_scroll [ Skip ]
 crbug.com/803461 [ Nexus_5 ] system_health.common_mobile/browse:chrome:newtab [ Skip ]