linux: move plugin blacklist check earlier
linux: move plugin blacklist check earlier

Plugins load in two stages: first we dlopen() them to query metadata,
then later in response to a page request we actually instantiate them.
The blacklist we had in place only happened at the latter point;
gecko-mediaplayer causes us to hang in the first step.  So move the
blacklist check earlier to succesfully blacklist it.

We eventually should just fix the bugs that cause this plugin to hang us,
but this will fix things for users right now.

BUG=24507,40221
TEST=run with --log-level=0 --debug-plugin-loading and verify gecko-mediaplayer is still blacklisted

Review URL: http://codereview.chromium.org/2114011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@47656 0039d316-1c4b-4281-b951-d872f2087c98

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