Test SIN6_LEN instead of OS_MACOSX to determine if sockaddr_in* structures have a sin*_len member.
Test SIN6_LEN instead of OS_MACOSX to determine if sockaddr_in*
structures have a sin*_len member.

The SIN6_LEN macro is required by RFC 3493 Section 3.4.  Since
Chrome requires the IPv6 socket API, it is fine to use SIN6_LEN
for the IPv6 sockaddr_in structure also.

R=agayev@chromium.org,cbentzel@chromium.org,eroman@chromium.org
BUG=none
TEST=none

Review URL: http://codereview.chromium.org/7461105

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@94324 0039d316-1c4b-4281-b951-d872f2087c98

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