Replacing mac builders with 10.8
Replacing mac builders with 10.8

BUG=353529

Review URL: https://codereview.chromium.org/246153002

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@265363 0039d316-1c4b-4281-b951-d872f2087c98

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