Remove deferred_from_coro from this PR.

scrapy/utils/defer.py

@@ -1,14 +1,10 @@
 """
 Helper functions for dealing with Twisted deferreds
 """
-import asyncio
-import inspect
-
 from twisted.internet import defer, task
 from twisted.python import failure
 
 from scrapy.exceptions import IgnoreRequest
-from scrapy.utils.asyncio import is_asyncio_reactor_installed
 
 
 def defer_fail(_failure):
@@ -118,27 +114,3 @@ def iter_errback(iterable, errback, *a, **kw):
             break
         except Exception:
             errback(failure.Failure(), *a, **kw)
-
-
-def _isfuture(o):
-    # workaround for Python before 3.5.3 not having asyncio.isfuture
-    if hasattr(asyncio, 'isfuture'):
-        return asyncio.isfuture(o)
-    return isinstance(o, asyncio.Future)
-
-
-def deferred_from_coro(o, asyncio_enabled=False):
-    """Converts a coroutine into a Deferred, or returns the object as is if it isn't a coroutine"""
-    if isinstance(o, defer.Deferred):
-        return o
-    if _isfuture(o) or inspect.isawaitable(o):
-        if not asyncio_enabled:
-            # wrapping the coroutine directly into a Deferred, this doesn't work correctly with coroutines
-            # that use asyncio, e.g. "await asyncio.sleep(1)"
-            return defer.ensureDeferred(o)
-        else:
-            # wrapping the coroutine into a Future and then into a Deferred, this requires AsyncioSelectorReactor
-            if not is_asyncio_reactor_installed():
-                raise TypeError('Using coroutines requires installing AsyncioSelectorReactor')
-            return defer.Deferred.fromFuture(asyncio.ensure_future(o))
-    return o