Cleans up style problems in architecture.py and test_runner.py

tools/utils.py

Index: tools/utils.py
diff --git a/tools/utils.py b/tools/utils.py
index 0917aa4f43a30a688dbdf9688e6aa9f177965a62..f65d9e6c273f41baf0aacc2bbe37afe53b7d17de 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -197,10 +197,19 @@ def Daemonize():
 
 
 def PrintError(str):
+  """Writes and flushes a string to stderr."""
   sys.stderr.write(str)
   sys.stderr.write('\n')
 
 
+def CheckedUnlink(name):
+  """Unlink a file without throwing an exception."""
+  try:
+    os.unlink(name)
+  except OSError, e:
+    PrintError("os.unlink() " + str(e))
+
+
 def Main(argv):
   print "GuessOS() -> ", GuessOS()
   print "GuessArchitecture() -> ", GuessArchitecture()