bpo-29617: Remove Python 3.3 support from asyncio (GH-232)

diff --git a/Lib/asyncio/events.py b/Lib/asyncio/events.py
index e85634e..6af9137 100644
--- a/Lib/asyncio/events.py
+++ b/Lib/asyncio/events.py
@@ -19,20 +19,15 @@
 import threading
 import traceback
 
-from asyncio import compat
-
 
 def _get_function_source(func):
-    if compat.PY34:
-        func = inspect.unwrap(func)
-    elif hasattr(func, '__wrapped__'):
-        func = func.__wrapped__
+    func = inspect.unwrap(func)
     if inspect.isfunction(func):
         code = func.__code__
         return (code.co_filename, code.co_firstlineno)
     if isinstance(func, functools.partial):
         return _get_function_source(func.func)
-    if compat.PY34 and isinstance(func, functools.partialmethod):
+    if isinstance(func, functools.partialmethod):
         return _get_function_source(func.func)
     return None