Remove all (CG) buildbot variants.

masters/master.chromium.webkit/master.cfg

Index: masters/master.chromium.webkit/master.cfg
===================================================================
--- masters/master.chromium.webkit/master.cfg	(revision 116664)
+++ masters/master.chromium.webkit/master.cfg	(working copy)
@@ -19,11 +19,9 @@
 import master_source_cfg
 import master_linux_webkit_pinned_cfg
 import master_mac_webkit_pinned_cfg
-import master_mac_webkit_pinned_cg_cfg
 import master_win_webkit_pinned_cfg
 import master_linux_webkit_latest_cfg
 import master_mac_webkit_latest_cfg
-import master_mac_webkit_latest_cg_cfg
 import master_win_webkit_latest_cfg
 import master_win_latest_cfg
 import master_mac_latest_cfg
@@ -33,11 +31,9 @@
 
 master_win_webkit_pinned_cfg.Update(config, ActiveMaster, c)
 master_mac_webkit_pinned_cfg.Update(config, ActiveMaster, c)
-master_mac_webkit_pinned_cg_cfg.Update(config, ActiveMaster, c)
 master_linux_webkit_pinned_cfg.Update(config, ActiveMaster, c)
 master_win_webkit_latest_cfg.Update(config, ActiveMaster, c)
 master_mac_webkit_latest_cfg.Update(config, ActiveMaster, c)
-master_mac_webkit_latest_cg_cfg.Update(config, ActiveMaster, c)
 master_linux_webkit_latest_cfg.Update(config, ActiveMaster, c)
 master_win_latest_cfg.Update(config, ActiveMaster, c)
 master_mac_latest_cfg.Update(config, ActiveMaster, c)