sort-headers.py: Do a case-insensitive sort instead.
sort-headers.py: Do a case-insensitive sort instead.

Otherwise the diff reports things like this:
-#include <uxtheme.h>
 #include <Vssym32.h>
+#include <uxtheme.h>

TEST=run ./tools/sort-headers.py, it should not report the above case.
R=thakis@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10446061

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@139294 0039d316-1c4b-4281-b951-d872f2087c98

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