Free gtk list.  Should fix valgrind warning
Free gtk list.  Should fix valgrind warning

24 (12 direct, 12 indirect) bytes in 1 blocks are definitely lost in loss record 54 of 258 
   at malloc (vg_replace_malloc.c:178)
   ...
   by gtk_container_foreach (in /usr/lib/libgtk-x11-2.0.so.0.1200.9)
   by gtk_container_get_children (in /usr/lib/libgtk-x11-2.0.so.0.1200.9)
   by (anonymous namespace)::OnDialogResponse(_GtkDialog*, int, AppModalDialog*) (app_modal_dialog_gtk.cc:24)

Review URL: http://codereview.chromium.org/102007

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@14855 0039d316-1c4b-4281-b951-d872f2087c98

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