Add arm/tegra2 CQ builders and major cleanup of dead code in chromeos_factory.

masters/master.chromium.chromiumos/master.cfg

Index: masters/master.chromium.chromiumos/master.cfg
diff --git a/masters/master.chromium.chromiumos/master.cfg b/masters/master.chromium.chromiumos/master.cfg
index 6620e91ac1372f3f238151ff264c2d6164caf426..49b3c1d460cbedc8197c5487a9dd6bf392dbeec7 100644
--- a/masters/master.chromium.chromiumos/master.cfg
+++ b/masters/master.chromium.chromiumos/master.cfg
@@ -238,25 +238,25 @@ f_chromium_linux_chromeos_clang_dbg = chromium_factory.ChromiumFactory(
                           'chromeos=1 fastbuild=1 target_arch=ia32'
     }})
 
-f_chromium_tot_chromeos_x86_generic = chromeos_factory.ChromeCbuildbotFactory(
+f_chromium_tot_chromeos_x86_generic = chromeos_factory.CbuildbotFactory(
   buildroot='/b/cbuild.x86',
   crostools_repo=None,
   pass_revision=True,
   params='x86-generic-tot-chrome-pfq-informational').get_factory()
 
-f_chromium_tot_chromeos_arm_generic = chromeos_factory.ChromeCbuildbotFactory(
+f_chromium_tot_chromeos_arm_generic = chromeos_factory.CbuildbotFactory(
   buildroot='/b/cbuild.arm',
   crostools_repo=None,
   pass_revision=True,
   params='arm-generic-tot-chrome-pfq-informational').get_factory()
 
-f_chromium_tot_chromeos_tegra2 = chromeos_factory.ChromeCbuildbotFactory(
+f_chromium_tot_chromeos_tegra2 = chromeos_factory.CbuildbotFactory(
   buildroot='/b/cbuild.tegra2',
   crostools_repo=None,
   pass_revision=True,
   params='arm-tegra2-tot-chrome-pfq-informational').get_factory()
 
-f_chromium_tot_chromeos_aura = chromeos_factory.ChromeCbuildbotFactory(
+f_chromium_tot_chromeos_aura = chromeos_factory.CbuildbotFactory(
   buildroot='/b/cbuild.aura',
   crostools_repo=None,
   pass_revision=True,