Increase maximum step timeout to 48 hours. Our dart2js checked debug mode is taking more than 8 hours to complete. Review URL: https://chromiumcodereview.appspot.com/9703109
Increase maximum step timeout to 48 hours.
Our dart2js checked debug mode is taking more than 8 hours to complete.
Review URL: https://chromiumcodereview.appspot.com/9703109

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@127142 0039d316-1c4b-4281-b951-d872f2087c98

eunchong/build,eunchong/build,eunchong/build,eunchong/build