Revert of Update mojo sdk to rev e083961bf11fd0c94d40be8853761da529b6d444

mojo/public/python/mojo/bindings/promise.py

Index: mojo/public/python/mojo/bindings/promise.py
diff --git a/mojo/public/python/mojo/bindings/promise.py b/mojo/public/python/mojo/bindings/promise.py
index ebf6f85e0dcc034f3346a8a2197170012831bb2b..c5d7d7cb641945e14af53d1b1d5e681db57d21b2 100644
--- a/mojo/public/python/mojo/bindings/promise.py
+++ b/mojo/public/python/mojo/bindings/promise.py
@@ -7,8 +7,6 @@
 
 The API is following the ECMAScript 6 API for promises.
 """
-
-import sys
 
 
 class Promise(object):
@@ -35,12 +33,8 @@
     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):
@@ -190,7 +184,5 @@
       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