Remove most comments about NaCL since it is fully supported. BUG=none TESTED=untested R=tpsiaki@google.com
Remove most comments about NaCL since it is fully supported.
BUG=none
TESTED=untested
R=tpsiaki@google.com

Review URL: https://webrtc-codereview.appspot.com/4579004

git-svn-id: a51711482b6ba0e1d1ab095578a045eeae45ac9a@878 16f28f9a-4ce2-e073-06de-1de4eb20be90

granalberto/libyuv,xlncz/libyuv,lyx2014/libyuv_free,jpxiong/libyuv,lemenkov/libyuv,CyanogenMod/android_external_chromium_org_third_party_libyuv,lemenkov/libyuv,openpeer/libyuv,labdong801/libyuv,okumura/libyuv,lyx2014/yuv,yarrcc/libyuv-ios,disigma/yuv,xlncz/libyuv,archos-sa/libyuv-avp,bpsinc-native/src_third_party_libyuv,phlizik/libyuv,PeterXu/libyuv,Bilibili/libyuv,PeterXu/libyuv,granalberto/libyuv,jgcaaprom/android_external_chromium_org_third_party_libyuv,lyx2014/libyuv_free,laperry1/android_external_chromium_org_third_party_libyuv,MIPS/external-chromium_org-third_party-libyuv,Gekkio/libyuv,AOSPU/external_chromium_org_third_party_libyuv,xin3liang/platform_external_chromium_org_third_party_libyuv,openpeer/libyuv,android-ia/platform_external_chromium_org_third_party_libyuv,pol51/libyuv-CMake,okumura/chromium-external-libyuv,labdong801/libyuv,rig-project/libyuv,bpsinc-native/src_third_party_libyuv,granalberto/libyuv,lemenkov/libyuv,granalberto/libyuv,MIPS/external-chromium_org-third_party-libyuv,archos-sa/libyuv-avp,Gekkio/libyuv,lemenkov/libyuv,lyx2014/libyuv_free,Omegaphora/external_chromium_org_third_party_libyuv,rig-project/libyuv,godghdai/libyuv,lyx2014/yuv,laperry1/android_external_chromium_org_third_party_libyuv,yarrcc/libyuv-ios,yarrcc/libyuv-ios,android-ia/platform_external_chromium_org_third_party_libyuv,godghdai/libyuv,disigma/yuv,CyanogenMod/android_external_chromium_org_third_party_libyuv,okumura/chromium-external-libyuv,xlncz/libyuv,android-ia/platform_external_chromium_org_third_party_libyuv,pol51/libyuv-CMake,jgcaaprom/android_external_chromium_org_third_party_libyuv,jpxiong/libyuv,Omegaphora/external_chromium_org_third_party_libyuv,okumura/libyuv,laperry1/android_external_chromium_org_third_party_libyuv,AOSPU/external_chromium_org_third_party_libyuv,xlncz/libyuv,jgcaaprom/android_external_chromium_org_third_party_libyuv,lyx2014/libyuv_free,CyanogenMod/android_external_chromium_org_third_party_libyuv,okumura/chromium-external-libyuv,jpxiong/libyuv,xin3liang/platform_external_chromium_org_third_party_libyuv,disigma/yuv,lyx2014/yuv,Bilibili/libyuv,lyx2014/yuv,Gekkio/libyuv,bpsinc-native/src_third_party_libyuv,godghdai/libyuv,pol51/libyuv-CMake,phlizik/libyuv,geekboxzone/lollipop_external_chromium_org_third_party_libyuv,geekboxzone/lollipop_external_chromium_org_third_party_libyuv,PeterXu/libyuv,Omegaphora/external_chromium_org_third_party_libyuv,labdong801/libyuv,Bilibili/libyuv,xin3liang/platform_external_chromium_org_third_party_libyuv,MIPS/external-chromium_org-third_party-libyuv,yarrcc/libyuv-ios,openpeer/libyuv,AOSPU/external_chromium_org_third_party_libyuv,archos-sa/libyuv-avp,geekboxzone/lollipop_external_chromium_org_third_party_libyuv,okumura/libyuv,rig-project/libyuv,phlizik/libyuv