Fixing pepper::FileIO::GetOSFileDescriptor(): 1. Return the actual file descriptor. 2. int cannot be converted to uintptr_t on Linux and Mac (and we don't need to do this).
Fixing pepper::FileIO::GetOSFileDescriptor():
1. Return the actual file descriptor.
2. int cannot be converted to uintptr_t on Linux and Mac (and we don't
need to do this).

Might have to come up with a better solution for the
base::PlatformFile --> int32_t conversion, but this should do for now,
to fix the build.

TEST=none
BUG=none
TBR=darin

Review URL: http://codereview.chromium.org/3293017

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@59046 0039d316-1c4b-4281-b951-d872f2087c98

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