Revert "[tools/perf] Disable flaky power.typical_10_mobile story"

This reverts commit 8bf0d21e.

Reason for revert: Test should be fixed now.

Original change's description:
> [tools/perf] Disable flaky power.typical_10_mobile story
> 
> TBR=perezju@chromium.org
> 
> Bug: 887546
> Change-Id: Ia96997eb631402aab7f5fe1ad4ede733d383969d
> Reviewed-on: https://chromium-review.googlesource.com/1236278
> Reviewed-by: Egor Pasko <pasko@chromium.org>
> Commit-Queue: Egor Pasko <pasko@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#592869}

TBR=pasko@chromium.org,perezju@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 887546
Change-Id: I07854cdd3517066f30b8e4de8018ce65c8494af9
Reviewed-on: https://chromium-review.googlesource.com/1248701Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Juan Antonio Navarro Pérez <perezju@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594651}

tools/perf/expectations.config

@@ -137,9 +137,6 @@ crbug.com/756119 [ All ] oilpan_gc_times.sync_scroll.key_mobile_sites_smooth/dig
 # Benchmark: oortonline
 crbug.com/815181 [ Win ] oortonline_tbmv2/http://oortonline.gl/#run [ Skip ]
 
-# Benchmark: power.typical_10_mobile
-crbug.com/887546 [ Android ] power.typical_10_mobile/http://m.chiebukuro.yahoo.co.jp/detail/q10136829180 [ Skip ]
-
 # Benchmark: rendering.desktop
 crbug.com/350692 [ All ] rendering.desktop/microsoft_performance [ Skip ]
 crbug.com/755556 [ Mac ] rendering.desktop/mix_blend_mode_animation_difference [ Skip ]