Enable the profiler on the simulator

R=asiva@google.com

Review URL: https://codereview.chromium.org//718393005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41752 260f80e4-7a28-3924-810f-c04153c831b5
Issue 21617. Replace explicit 'this' references and clean ups.

R=brianwilkerson@google.com
BUG= https://code.google.com/p/dart/issues/detail?id=21617

Review URL: https://codereview.chromium.org//733663002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41753 260f80e4-7a28-3924-810f-c04153c831b5