Make download_query work if ICU is built without std::string.
Make download_query work if ICU is built without std::string.

download_query.cc relies on being able to pass a std::string to
icu::UnicodeString::fromUTF8, which doesn't work if use_system_icu is
enabled and the system ICU doesn't have std::string support (e.g.
Android). Avoid the need for this by passing it as a C string.


Review URL: https://chromiumcodereview.appspot.com/10356073

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@136281 0039d316-1c4b-4281-b951-d872f2087c98

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