Fix NaCl plugin shutdown when running the Chrome PPAPI proxy. BUG=116317 TEST=manual
Fix NaCl plugin shutdown when running the Chrome PPAPI proxy.
BUG=116317
TEST=manual

Changes the order that DidDestroy for the untrusted plugin and the trusted
NaCl plugin are called. This allows the plugin to initiate shutdown before
the untrusted plugin, which may hang.
Review URL: https://chromiumcodereview.appspot.com/10824220

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@151217 0039d316-1c4b-4281-b951-d872f2087c98

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