Fix leak of g_object_get value.  This was showing up on the valgrind ui test buildbot.
Fix leak of g_object_get value.  This was showing up on the
valgrind ui test buildbot.

The docs say we have to free the value:
http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#g-object-get

BUG=16724

Review URL: http://codereview.chromium.org/155515


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@20657 0039d316-1c4b-4281-b951-d872f2087c98

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