fixup! Use sys._current_frames instead of threadframe.

Forgot to drop extra threadframe references.

product/DeadlockDebugger/README.txt

@@ -14,14 +14,6 @@ DeadlockDebugger can of course also be used in non-deadlock situations,
 when a Zope process is taking a long time and you wish to know what code
 is being executed.
 
-Installation
-------------
-
-This product requires the 'threadframe' python module
-(http://www.majid.info/mylos/stories/2004/06/10/threadframe.html).
-When DeadlockDebugger starts, it verifies that threadframe is available,
-please check the event.log for ERROR message.
-
 Configuration
 -------------
 

product/DeadlockDebugger/__init__.py

@@ -28,13 +28,8 @@ You MUST configure zope.conf before use.
 from zLOG import LOG, INFO, ERROR
 from App.config import getConfiguration
 
-try:
-    import threadframe
-except ImportError:
-    LOG('DeadlockDebugger', ERROR, "Incorrectly installed threadframe module")
-else:
-    config = getConfiguration()
-    if getattr(config, 'product_config', None) is not None:
+config = getConfiguration()
+if getattr(config, 'product_config', None) is not None:
     deadlockdebugger = config.product_config.get('deadlockdebugger')
     dump_url = ''
     secret = ''