[webapi] Revise README file of Native Client suite
[webapi] Revise README file of Native Client suite

Actually the Native Client hasn't been enabled by Crosswalk Project for
Android, and it won't be enabled in near future.

But per https://crosswalk-project.org/jira/browse/XWALK-1339, NaCl works
fine in upstream crosswalk-8.36.161.0 with tizen_20140625.3 image.

kaixinjxq/crosswalk-test-suite,ibelem/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,zqzhang/crosswalk-test-suite,BruceDai/crosswalk-test-suite,zqzhang/crosswalk-test-suite,ibelem/crosswalk-test-suite,kangxu/crosswalk-test-suite,BruceDai/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,zqzhang/crosswalk-test-suite,yhe39/crosswalk-test-suite,haoxli/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,yunxliu/crosswalk-test-suite,chunywang/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,kangxu/crosswalk-test-suite,BruceDai/crosswalk-test-suite,kangxu/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,ibelem/crosswalk-test-suite,zqzhang/crosswalk-test-suite,ibelem/crosswalk-test-suite,haoxli/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,chunywang/crosswalk-test-suite,yunxliu/crosswalk-test-suite,Honry/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,haoxli/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,yunxliu/crosswalk-test-suite,haoxli/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,zqzhang/crosswalk-test-suite,BruceDai/crosswalk-test-suite,yhe39/crosswalk-test-suite,kangxu/crosswalk-test-suite,chunywang/crosswalk-test-suite,BruceDai/crosswalk-test-suite,Honry/crosswalk-test-suite,Honry/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,ibelem/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,haoxli/crosswalk-test-suite,Honry/crosswalk-test-suite,chunywang/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,Honry/crosswalk-test-suite,yunxliu/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,yunxliu/crosswalk-test-suite,yunxliu/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,haoxli/crosswalk-test-suite,yhe39/crosswalk-test-suite,yhe39/crosswalk-test-suite,yhe39/crosswalk-test-suite,BruceDai/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,kangxu/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,haoxli/crosswalk-test-suite,zqzhang/crosswalk-test-suite,haoxli/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,yhe39/crosswalk-test-suite,chunywang/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,ibelem/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,yunxliu/crosswalk-test-suite,kangxu/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,wanghongjuan/crosswalk-test-suite,chunywang/crosswalk-test-suite,yhe39/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,chunywang/crosswalk-test-suite,kaixinjxq/crosswalk-test-suite,ibelem/crosswalk-test-suite,zqzhang/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,haoyunfeix/crosswalk-test-suite,Honry/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,yunxliu/crosswalk-test-suite,kangxu/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,BruceDai/crosswalk-test-suite,crosswalk-project/crosswalk-test-suite,ibelem/crosswalk-test-suite,Shao-Feng/crosswalk-test-suite,zqzhang/crosswalk-test-suite,yhe39/crosswalk-test-suite,zhuyongyong/crosswalk-test-suite,Honry/crosswalk-test-suite,Honry/crosswalk-test-suite,BruceDai/crosswalk-test-suite,kangxu/crosswalk-test-suite,chunywang/crosswalk-test-suite