Don't delete npapi plugins copied into <(PRODUCT_DIR)/plugins during UI tests.
Don't delete npapi plugins copied into <(PRODUCT_DIR)/plugins
during UI tests.

The layout test plugin is copied over via a build step and needed
when running the layout tests.  If you run the UI tests before
the layout tests, the npapi layout test plugin is deleted and
causes layout tests to fail.  Seems like it's safe to keep the plugins
even after the UI tests end.

Review URL: http://codereview.chromium.org/3066033

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@54965 0039d316-1c4b-4281-b951-d872f2087c98

ltilve/chromium,dushu1203/chromium.src,littlstar/chromium.src,dushu1203/chromium.src,nacl-webkit/chrome_deps,chuan9/chromium-crosswalk,nacl-webkit/chrome_deps,ChromiumWebApps/chromium,dednal/chromium.src,mogoweb/chromium-crosswalk,Chilledheart/chromium,timopulkkinen/BubbleFish,ondra-novak/chromium.src,robclark/chromium,jaruba/chromium.src,Fireblend/chromium-crosswalk,hujiajie/pa-chromium,dushu1203/chromium.src,Just-D/chromium-1,Jonekee/chromium.src,zcbenz/cefode-chromium,ltilve/chromium,Jonekee/chromium.src,Chilledheart/chromium,Fireblend/chromium-crosswalk,Chilledheart/chromium,hgl888/chromium-crosswalk-efl,dednal/chromium.src,jaruba/chromium.src,timopulkkinen/BubbleFish,dednal/chromium.src,chuan9/chromium-crosswalk,ChromiumWebApps/chromium,ChromiumWebApps/chromium,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,M4sse/chromium.src,hujiajie/pa-chromium,robclark/chromium,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,zcbenz/cefode-chromium,fujunwei/chromium-crosswalk,keishi/chromium,markYoungH/chromium.src,bright-sparks/chromium-spacewalk,anirudhSK/chromium,hgl888/chromium-crosswalk-efl,zcbenz/cefode-chromium,Fireblend/chromium-crosswalk,rogerwang/chromium,bright-sparks/chromium-spacewalk,littlstar/chromium.src,hgl888/chromium-crosswalk-efl,chuan9/chromium-crosswalk,Fireblend/chromium-crosswalk,hujiajie/pa-chromium,timopulkkinen/BubbleFish,dushu1203/chromium.src,dushu1203/chromium.src,Pluto-tv/chromium-crosswalk,bright-sparks/chromium-spacewalk,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,littlstar/chromium.src,nacl-webkit/chrome_deps,Pluto-tv/chromium-crosswalk,keishi/chromium,Pluto-tv/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,timopulkkinen/BubbleFish,ondra-novak/chromium.src,hgl888/chromium-crosswalk,hujiajie/pa-chromium,hgl888/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,timopulkkinen/BubbleFish,junmin-zhu/chromium-rivertrail,junmin-zhu/chromium-rivertrail,ondra-novak/chromium.src,robclark/chromium,Just-D/chromium-1,Chilledheart/chromium,hgl888/chromium-crosswalk,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,hgl888/chromium-crosswalk-efl,ondra-novak/chromium.src,Chilledheart/chromium,hgl888/chromium-crosswalk,dushu1203/chromium.src,hujiajie/pa-chromium,rogerwang/chromium,Jonekee/chromium.src,M4sse/chromium.src,patrickm/chromium.src,axinging/chromium-crosswalk,pozdnyakov/chromium-crosswalk,bright-sparks/chromium-spacewalk,patrickm/chromium.src,Pluto-tv/chromium-crosswalk,krieger-od/nwjs_chromium.src,littlstar/chromium.src,mohamed--abdel-maksoud/chromium.src,dednal/chromium.src,nacl-webkit/chrome_deps,ondra-novak/chromium.src,robclark/chromium,crosswalk-project/chromium-crosswalk-efl,littlstar/chromium.src,hgl888/chromium-crosswalk,timopulkkinen/BubbleFish,fujunwei/chromium-crosswalk,markYoungH/chromium.src,dednal/chromium.src,junmin-zhu/chromium-rivertrail,anirudhSK/chromium,anirudhSK/chromium,M4sse/chromium.src,hgl888/chromium-crosswalk,axinging/chromium-crosswalk,jaruba/chromium.src,junmin-zhu/chromium-rivertrail,ChromiumWebApps/chromium,chuan9/chromium-crosswalk,hujiajie/pa-chromium,ltilve/chromium,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,bright-sparks/chromium-spacewalk,Jonekee/chromium.src,robclark/chromium,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src,fujunwei/chromium-crosswalk,mogoweb/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,M4sse/chromium.src,crosswalk-project/chromium-crosswalk-efl,ondra-novak/chromium.src,krieger-od/nwjs_chromium.src,pozdnyakov/chromium-crosswalk,hujiajie/pa-chromium,crosswalk-project/chromium-crosswalk-efl,M4sse/chromium.src,markYoungH/chromium.src,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,robclark/chromium,patrickm/chromium.src,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,nacl-webkit/chrome_deps,Chilledheart/chromium,ChromiumWebApps/chromium,M4sse/chromium.src,mogoweb/chromium-crosswalk,timopulkkinen/BubbleFish,junmin-zhu/chromium-rivertrail,TheTypoMaster/chromium-crosswalk,zcbenz/cefode-chromium,junmin-zhu/chromium-rivertrail,pozdnyakov/chromium-crosswalk,zcbenz/cefode-chromium,jaruba/chromium.src,littlstar/chromium.src,pozdnyakov/chromium-crosswalk,hgl888/chromium-crosswalk-efl,timopulkkinen/BubbleFish,nacl-webkit/chrome_deps,crosswalk-project/chromium-crosswalk-efl,crosswalk-project/chromium-crosswalk-efl,timopulkkinen/BubbleFish,axinging/chromium-crosswalk,anirudhSK/chromium,zcbenz/cefode-chromium,axinging/chromium-crosswalk,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,robclark/chromium,keishi/chromium,keishi/chromium,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk-efl,keishi/chromium,timopulkkinen/BubbleFish,Fireblend/chromium-crosswalk,Chilledheart/chromium,pozdnyakov/chromium-crosswalk,patrickm/chromium.src,rogerwang/chromium,TheTypoMaster/chromium-crosswalk,mogoweb/chromium-crosswalk,mogoweb/chromium-crosswalk,keishi/chromium,markYoungH/chromium.src,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,fujunwei/chromium-crosswalk,Fireblend/chromium-crosswalk,anirudhSK/chromium,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,Jonekee/chromium.src,Just-D/chromium-1,ltilve/chromium,krieger-od/nwjs_chromium.src,M4sse/chromium.src,dushu1203/chromium.src,patrickm/chromium.src,fujunwei/chromium-crosswalk,krieger-od/nwjs_chromium.src,Fireblend/chromium-crosswalk,rogerwang/chromium,jaruba/chromium.src,zcbenz/cefode-chromium,pozdnyakov/chromium-crosswalk,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,PeterWangIntel/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,axinging/chromium-crosswalk,hgl888/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,keishi/chromium,littlstar/chromium.src,timopulkkinen/BubbleFish,rogerwang/chromium,M4sse/chromium.src,hgl888/chromium-crosswalk-efl,ondra-novak/chromium.src,ChromiumWebApps/chromium,jaruba/chromium.src,axinging/chromium-crosswalk,junmin-zhu/chromium-rivertrail,anirudhSK/chromium,littlstar/chromium.src,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,anirudhSK/chromium,bright-sparks/chromium-spacewalk,keishi/chromium,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,chuan9/chromium-crosswalk,markYoungH/chromium.src,mogoweb/chromium-crosswalk,dednal/chromium.src,fujunwei/chromium-crosswalk,ondra-novak/chromium.src,PeterWangIntel/chromium-crosswalk,anirudhSK/chromium,junmin-zhu/chromium-rivertrail,markYoungH/chromium.src,anirudhSK/chromium,PeterWangIntel/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,mohamed--abdel-maksoud/chromium.src,ChromiumWebApps/chromium,robclark/chromium,hgl888/chromium-crosswalk,markYoungH/chromium.src,ltilve/chromium,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,Pluto-tv/chromium-crosswalk,hgl888/chromium-crosswalk,ltilve/chromium,mogoweb/chromium-crosswalk,Just-D/chromium-1,ltilve/chromium,mogoweb/chromium-crosswalk,dushu1203/chromium.src,hgl888/chromium-crosswalk,rogerwang/chromium,mohamed--abdel-maksoud/chromium.src,chuan9/chromium-crosswalk,mogoweb/chromium-crosswalk,pozdnyakov/chromium-crosswalk,markYoungH/chromium.src,jaruba/chromium.src,robclark/chromium,axinging/chromium-crosswalk,patrickm/chromium.src,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,hujiajie/pa-chromium,dushu1203/chromium.src,Pluto-tv/chromium-crosswalk,rogerwang/chromium,axinging/chromium-crosswalk,fujunwei/chromium-crosswalk,Chilledheart/chromium,Just-D/chromium-1,hujiajie/pa-chromium,PeterWangIntel/chromium-crosswalk,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk,dednal/chromium.src,ChromiumWebApps/chromium,krieger-od/nwjs_chromium.src,pozdnyakov/chromium-crosswalk,rogerwang/chromium,krieger-od/nwjs_chromium.src,bright-sparks/chromium-spacewalk,TheTypoMaster/chromium-crosswalk,zcbenz/cefode-chromium,keishi/chromium,anirudhSK/chromium,M4sse/chromium.src,ChromiumWebApps/chromium,Jonekee/chromium.src,dednal/chromium.src,markYoungH/chromium.src,Fireblend/chromium-crosswalk,jaruba/chromium.src,chuan9/chromium-crosswalk,hujiajie/pa-chromium,zcbenz/cefode-chromium,rogerwang/chromium,Just-D/chromium-1,ondra-novak/chromium.src,markYoungH/chromium.src,crosswalk-project/chromium-crosswalk-efl,nacl-webkit/chrome_deps,anirudhSK/chromium,Chilledheart/chromium,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,pozdnyakov/chromium-crosswalk,anirudhSK/chromium,dednal/chromium.src,TheTypoMaster/chromium-crosswalk,ltilve/chromium,PeterWangIntel/chromium-crosswalk,rogerwang/chromium,krieger-od/nwjs_chromium.src,chuan9/chromium-crosswalk,dednal/chromium.src,ChromiumWebApps/chromium,chuan9/chromium-crosswalk,M4sse/chromium.src,patrickm/chromium.src,bright-sparks/chromium-spacewalk,axinging/chromium-crosswalk,jaruba/chromium.src,keishi/chromium,nacl-webkit/chrome_deps,Jonekee/chromium.src,TheTypoMaster/chromium-crosswalk,nacl-webkit/chrome_deps,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,keishi/chromium,zcbenz/cefode-chromium,mogoweb/chromium-crosswalk,ChromiumWebApps/chromium,ltilve/chromium,M4sse/chromium.src,Jonekee/chromium.src,mohamed--abdel-maksoud/chromium.src,Jonekee/chromium.src,Just-D/chromium-1,robclark/chromium,jaruba/chromium.src,bright-sparks/chromium-spacewalk,zcbenz/cefode-chromium,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src