Add bot. prefix to unbreak build bots.

dart/tools/bots/compiler.py

 #!/usr/bin/python
 
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """
 Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
@@ skipping 283 matching lines @@
     CleanUpTemporaryFiles(build_info.system, build_info.runtime)
 
 
 def BuildCompiler(build_info):
   """
   Builds the SDK.
 
   - build_info: the buildInfo object, containing information about what sort of
       build and test to be run.
   """
-  with BuildStep('Build SDK and d8'):
+  with bot.BuildStep('Build SDK and d8'):
     args = [sys.executable, './tools/build.py', '--mode=' + build_info.mode,
             'dart2js_bot']
     print 'Build SDK and d8: %s' % (' '.join(args))
-    RunProcess(args)
+    bot.RunProcess(args)
 
 
 if __name__ == '__main__':
   bot.RunBot(GetBuildInfo, RunCompilerTests, build_step=BuildCompiler)