Removing default trybot names

This is removing the default try bot names added in r3031. It doesn't seem like we need to avoid sending all jobs to these bots, even if they're much slower.

BUG=none
TEST=none

Review URL: https://webrtc-codereview.appspot.com/978004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3258 4adac7df-926f-26a2-2b94-8c16560cd09d

PRESUBMIT.py

@@ -160,10 +160,3 @@ def CheckChangeOnCommit(input_api, output_api):
       input_api, output_api))
   return results
 
-def GetPreferredTrySlaves(project, change):
-  files = change.LocalPaths()
-  if not files:
-    return []
-  # Default trybots to run jobs at (if --bot is not specified).
-  return ['win', 'win_rel', 'mac', 'mac_rel', 'linux', 'linux_rel',
-          'android', 'android_ndk']