basefilectx: move filenode from filectx

mercurial/context.py

@@ -479,6 +479,8 b' class basefilectx(object):'
 
     def filerev(self):
         return self._filerev
+    def filenode(self):
+        return self._filenode
 
 class filectx(basefilectx):
     """A filecontext object makes access to data related to a particular
@@ -535,8 +537,6 b' class filectx(basefilectx):'
         return filectx(self._repo, self._path, fileid=fileid,
                        filelog=self._filelog)
 
-    def filenode(self):
-        return self._filenode
     def flags(self):
         return self._changectx.flags(self._path)
     def filelog(self):