Revert of mojo: Add a runloop utility in python

mojo/python/tests/runloop_unittest.py

-# Copyright 2014 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import unittest
-
-# pylint: disable=F0401
-import mojo.embedder
-from mojo import system
-
-
-def _Increment(array):
-  def _Closure():
-    array.append(0)
-  return _Closure
-
-
-class RunLoopTest(unittest.TestCase):
-
-  def setUp(self):
-    mojo.embedder.Init()
-
-  def testRunLoop(self):
-    loop = system.RunLoop()
-    array = []
-    for _ in xrange(10):
-      loop.PostDelayedTask(_Increment(array))
-    loop.RunUntilIdle()
-    self.assertEquals(len(array), 10)
-
-  def testRunLoopWithException(self):
-    loop = system.RunLoop()
-    def Throw():
-      raise Exception("error")
-    array = []
-    loop.PostDelayedTask(Throw)
-    loop.PostDelayedTask(_Increment(array))
-    with self.assertRaisesRegexp(Exception, '^error$'):
-      loop.Run()
-    self.assertEquals(len(array), 0)
-    loop.RunUntilIdle()
-    self.assertEquals(len(array), 1)