V8 Buildbot: Improve branch builder order for status bar.
V8 Buildbot: Improve branch builder order for status bar.

The status bar ignores the order with categories on the actual waterfall and just reads the builder list:
http://build.chromium.org/p/client.v8.branches/horizontal_one_box_per_builder

Review URL: https://chromiumcodereview.appspot.com/23530035

git-svn-id: 239fca9b83025a0b6f823aeeca02ba5be3d9fd76@221379 0039d316-1c4b-4281-b951-d872f2087c98

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