Implement NPN_reloadPlugins.
Implement NPN_reloadPlugins.

The one catch is that in multiprocess Chromium, if reloadPages
is true, we only reload pages that are in the same process.
This is probably what is wanted most of the time (to reload the
page that triggered this) and avoids unnecessary reloads.

BUG=29018
TEST=Covered by existing layout tests.

Review URL: http://codereview.chromium.org/4618001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@65391 0039d316-1c4b-4281-b951-d872f2087c98

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