Replace vm682-m3 with vm642-m3 in master.client.dart
Replace vm682-m3 with vm642-m3 in master.client.dart

BUG=418033

Review URL: https://codereview.chromium.org/645613004

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@292421 0039d316-1c4b-4281-b951-d872f2087c98

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