Revert of Use apps::AppEventRouter to launch app_shell apps (https://codereview.chromium.org/219513005/)
Revert of Use apps::AppEventRouter to launch app_shell apps (https://codereview.chromium.org/219513005/)

Reason for revert:
This creates an unwanted dependency from app_shell back onto apps (we're moving it to depend only on extensions to keep the binary small).


Original issue's description:
> Use apps::AppEventRouter to launch app_shell apps
> 
> Now that the app_runtime API has moved to //apps we can eliminate a small
> amount of code duplication in app_shell.
> 
> BUG=357818
> TEST=app_shell launches calculator
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260647

TBR=rockot@chromium.org
NOTRY=true
BUG=357818

Review URL: https://codereview.chromium.org/224173002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@261455 0039d316-1c4b-4281-b951-d872f2087c98

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