removing build5-m4 from unused slaves. (repurposed in M3)
removing build5-m4 from unused slaves. (repurposed in M3)

Review URL: https://codereview.chromium.org/60733008

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@233392 0039d316-1c4b-4281-b951-d872f2087c98

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