Revert of Update mojo sdk to rev e083961bf11fd0c94d40be8853761da529b6d444

mojo/public/python/mojo/bindings/promise.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.
 
 """
 Promise used by the python bindings.
 
 The API is following the ECMAScript 6 API for promises.
 """
 
-import sys
-
 
 class Promise(object):
   """The promise object."""
 
   STATE_PENDING = 0
   STATE_FULLFILLED = 1
   STATE_REJECTED = 2
   STATE_BOUND = 3
 
   def __init__(self, generator_function):
     """
     Constructor.
 
     Args:
       generator_function: A function taking 2 arguments: resolve and reject.
       When |resolve| is called, the promise is fullfilled with the given value.
       When |reject| is called, the promise is rejected with the given value.
       A promise can only be resolved or rejected once, all following calls will
       have no effect.
     """
     self._onCatched = []
     self._onFulfilled = []
     self._onRejected = []
     self._state = Promise.STATE_PENDING
     self._result = None
-    try:
+    if generator_function:
       generator_function(self._Resolve, self._Reject)
-    except Exception as e:
-      # Adding traceback similarly to python 3.0 (pep-3134)
-      e.__traceback__ = sys.exc_info()[2]
-      self._Reject(e)
 
   @staticmethod
   def Resolve(value):
     """
     If value is a promise, make a promise that have the same behavior as value,
     otherwise make a promise that fulfills to value.
     """
     if isinstance(value, Promise):
       return value
     return Promise(lambda x, y: x(value))
@@ skipping 129 matching lines @@
 
 
 def _Delegate(resolve, reject, action):
   def _Run(x):
     try:
       if action:
         resolve(action(x))
       else:
         resolve(x)
     except Exception as e:
-      # Adding traceback similarly to python 3.0 (pep-3134)
-      e.__traceback__ = sys.exc_info()[2]
       reject(e)
   return _Run