flagprocessors: remove flagprocessorsmixin

It became an empty shell.

Differential Revision: https://phab.mercurial-scm.org/D6823

hgext/remotefilelog/remotefilelog.py

@@ -47,7 +47,7 b' class remotefilelognodemap(object):'
             raise KeyError(node)
         return node
 
-class remotefilelog(flagutil.flagprocessorsmixin):
+class remotefilelog(object):
 
     _generaldelta = True
     _flagserrorclass = error.RevlogError

mercurial/revlog.py

@@ -261,7 +261,7 b' class revlogio(object):'
             p = versionformat_pack(version) + p[4:]
         return p
 
-class revlog(flagutil.flagprocessorsmixin):
+class revlog(object):
     """
     the underlying revision storage object
 

mercurial/revlogutils/flagutil.py

@@ -79,14 +79,6 b' def insertflagprocessor(flag, processor,'
         raise error.Abort(msg)
     flagprocessors[flag] = processor
 
-class flagprocessorsmixin(object):
-    """basic mixin to support revlog flag processing
-
-    Make sure the `_flagprocessors` attribute is set at ``__init__`` time.
-
-    See the documentation of the ``_processflags`` method for details.
-    """
-
 def processflagswrite(revlog, text, flags, sidedata):
     """Inspect revision data flags and applies write transformations defined
     by registered flag processors.

tests/simplestorerepo.py

@@ -91,7 +91,7 b' class simplefilestoreproblem(object):'
     node = attr.ib(default=None)
 
 @interfaceutil.implementer(repository.ifilestorage)
-class filestorage(flagutil.flagprocessorsmixin):
+class filestorage(object):
     """Implements storage for a tracked path.
 
     Data is stored in the VFS in a directory corresponding to the tracked