Revert of Remove ash_unittests to see if it's affecting bot stability (https://codereview.chromium.org/411673002/)
Revert of Remove ash_unittests to see if it's affecting bot stability (https://codereview.chromium.org/411673002/)

Reason for revert:
Was not the cause of flakiness.

Original issue's description:
> Remove ash_unittests to see if it's affecting bot stability
> 
> Bot has been completely failing intermittently. ash_unittests
> is the Win8-specific part that runs here, so temporarily remove
> it to see if it's related to the back-and-forth to Metro
> switches.
> 
> BUG=340422
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284820

TBR=sky@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=340422

Review URL: https://codereview.chromium.org/414783002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@284993 0039d316-1c4b-4281-b951-d872f2087c98

dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,jaruba/chromium.src,Fireblend/chromium-crosswalk,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk,krieger-od/nwjs_chromium.src,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,hgl888/chromium-crosswalk-efl,chuan9/chromium-crosswalk,chuan9/chromium-crosswalk,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,jaruba/chromium.src,krieger-od/nwjs_chromium.src,mohamed--abdel-maksoud/chromium.src,Just-D/chromium-1,crosswalk-project/chromium-crosswalk-efl,Chilledheart/chromium,littlstar/chromium.src,hgl888/chromium-crosswalk,ondra-novak/chromium.src,dushu1203/chromium.src,dednal/chromium.src,chuan9/chromium-crosswalk,markYoungH/chromium.src,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,ltilve/chromium,M4sse/chromium.src,fujunwei/chromium-crosswalk,M4sse/chromium.src,bright-sparks/chromium-spacewalk,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,dushu1203/chromium.src,markYoungH/chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,axinging/chromium-crosswalk,Jonekee/chromium.src,littlstar/chromium.src,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,Pluto-tv/chromium-crosswalk,hgl888/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,dushu1203/chromium.src,fujunwei/chromium-crosswalk,markYoungH/chromium.src,ondra-novak/chromium.src,ltilve/chromium,TheTypoMaster/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,markYoungH/chromium.src,hgl888/chromium-crosswalk,dushu1203/chromium.src,krieger-od/nwjs_chromium.src,axinging/chromium-crosswalk,jaruba/chromium.src,ltilve/chromium,M4sse/chromium.src,Fireblend/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,jaruba/chromium.src,littlstar/chromium.src,M4sse/chromium.src,Jonekee/chromium.src,Pluto-tv/chromium-crosswalk,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk-efl,dednal/chromium.src,ltilve/chromium,markYoungH/chromium.src,ltilve/chromium,ondra-novak/chromium.src,axinging/chromium-crosswalk,jaruba/chromium.src,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,dushu1203/chromium.src,fujunwei/chromium-crosswalk,M4sse/chromium.src,Jonekee/chromium.src,hgl888/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,TheTypoMaster/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,markYoungH/chromium.src,jaruba/chromium.src,hgl888/chromium-crosswalk-efl,ondra-novak/chromium.src,Pluto-tv/chromium-crosswalk,Pluto-tv/chromium-crosswalk,axinging/chromium-crosswalk,dednal/chromium.src,Fireblend/chromium-crosswalk,jaruba/chromium.src,Jonekee/chromium.src,fujunwei/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,ondra-novak/chromium.src,krieger-od/nwjs_chromium.src,dushu1203/chromium.src,krieger-od/nwjs_chromium.src,Just-D/chromium-1,crosswalk-project/chromium-crosswalk-efl,Just-D/chromium-1,M4sse/chromium.src,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,dushu1203/chromium.src,Chilledheart/chromium,ltilve/chromium,dednal/chromium.src,mohamed--abdel-maksoud/chromium.src,PeterWangIntel/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,fujunwei/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk,Fireblend/chromium-crosswalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,bright-sparks/chromium-spacewalk,dushu1203/chromium.src,ondra-novak/chromium.src,Jonekee/chromium.src,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,littlstar/chromium.src,PeterWangIntel/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,ondra-novak/chromium.src,axinging/chromium-crosswalk,Chilledheart/chromium,Jonekee/chromium.src,dednal/chromium.src,Jonekee/chromium.src,Jonekee/chromium.src,ltilve/chromium,littlstar/chromium.src,dednal/chromium.src,Chilledheart/chromium,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,fujunwei/chromium-crosswalk,markYoungH/chromium.src,hgl888/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,PeterWangIntel/chromium-crosswalk,axinging/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,dushu1203/chromium.src,chuan9/chromium-crosswalk,dednal/chromium.src,bright-sparks/chromium-spacewalk,ondra-novak/chromium.src,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,Jonekee/chromium.src,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,jaruba/chromium.src,krieger-od/nwjs_chromium.src,Just-D/chromium-1,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,Fireblend/chromium-crosswalk,axinging/chromium-crosswalk,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,hgl888/chromium-crosswalk,Just-D/chromium-1,TheTypoMaster/chromium-crosswalk,littlstar/chromium.src,hgl888/chromium-crosswalk-efl,bright-sparks/chromium-spacewalk,chuan9/chromium-crosswalk,dednal/chromium.src,fujunwei/chromium-crosswalk,Chilledheart/chromium,hgl888/chromium-crosswalk-efl,markYoungH/chromium.src,ltilve/chromium,Chilledheart/chromium,Pluto-tv/chromium-crosswalk,Just-D/chromium-1,Chilledheart/chromium,littlstar/chromium.src,markYoungH/chromium.src,fujunwei/chromium-crosswalk,littlstar/chromium.src,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,Fireblend/chromium-crosswalk,dednal/chromium.src,M4sse/chromium.src,bright-sparks/chromium-spacewalk,jaruba/chromium.src,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,Pluto-tv/chromium-crosswalk,ltilve/chromium,M4sse/chromium.src