Use ninja on chromium.mac
Use ninja on chromium.mac

R=maruel@chromium.org
BUG=233710

Review URL: https://chromiumcodereview.appspot.com/14356003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@195285 0039d316-1c4b-4281-b951-d872f2087c98

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