V8 Buildbot: Make branch schedulers more specific.
V8 Buildbot: Make branch schedulers more specific.

With this CL, only changes to trunk, beta and stable are shown on the branch waterfall.

Review URL: https://chromiumcodereview.appspot.com/24027003

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@221994 0039d316-1c4b-4281-b951-d872f2087c98

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