Construct a WebString explicitly and pass to a WebKit method. This is to prevent build errors when https://bugs.webkit.org/show_bug.cgi?id=48068 lands.
Construct a WebString explicitly and pass to a WebKit method.
This is to prevent build errors when https://bugs.webkit.org/show_bug.cgi?id=48068 lands.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/4022003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63365 0039d316-1c4b-4281-b951-d872f2087c98

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