diff --git a/IPython/html/services/contents/manager.py b/IPython/html/services/contents/manager.py
index f8aeec2..ec2f7db 100644
--- a/IPython/html/services/contents/manager.py
+++ b/IPython/html/services/contents/manager.py
@@ -30,21 +30,6 @@ from IPython.utils.py3compat import string_types
 copy_pat = re.compile(r'\-Copy\d*\.')
 
 
-def _separate_dirs_files(models):
-    """
-    Split an iterable of models into a list of file paths and a list of
-    directory paths.
-    """
-    dirs = []
-    files = []
-    for model in models:
-        if model['type'] == 'directory':
-            dirs.append(model['path'])
-        else:
-            files.append(model['path'])
-    return dirs, files
-
-
 class CheckpointManager(LoggingConfigurable):
     """
     Base class for managing checkpoints for a ContentsManager.
@@ -514,31 +499,6 @@ class ContentsManager(LoggingConfigurable):
         """Should this file/directory name be displayed in a listing?"""
         return not any(fnmatch(name, glob) for glob in self.hide_globs)
 
-    def walk(self):
-        """
-        Like os.walk, but written in terms of the ContentsAPI.
-
-        Returns a generator of tuples of the form:
-        (directory name, [subdirectories], [files in directory])
-        """
-        return self._walk([''])
-
-    def _walk(self, dirs):
-        """
-        Recursive helper for walk.
-        """
-        for directory in dirs:
-            children = self.get(
-                directory,
-                content=True,
-                type='directory',
-            )['content']
-            dirs, files = map(sorted, _separate_dirs_files(children))
-            yield (directory, dirs, files)
-            if dirs:
-                for entry in self._walk(dirs):
-                    yield(entry)
-
     # Part 3: Checkpoints API
     def create_checkpoint(self, path):
         """Create a checkpoint."""
diff --git a/IPython/html/services/contents/tests/test_contents_api.py b/IPython/html/services/contents/tests/test_contents_api.py
index 6fa2ec9..3c0d33a 100644
--- a/IPython/html/services/contents/tests/test_contents_api.py
+++ b/IPython/html/services/contents/tests/test_contents_api.py
@@ -614,82 +614,3 @@ class APITest(NotebookTestBase):
         with TemporaryDirectory() as td:
             with self.patch_cp_root(td):
                 self.test_file_checkpoints()
-
-    def test_walk(self):
-        """
-        Test ContentsManager.walk.
-        """
-        results = list(self.notebook.contents_manager.walk())
-        expected = [
-            (
-                '',
-                [
-                    'Directory with spaces in',
-                    'foo',
-                    'ordering',
-                    u'unicodé',
-                    u'å b',
-                ],
-                ['inroot.blob', 'inroot.ipynb', 'inroot.txt'],
-            ),
-            (
-                'Directory with spaces in',
-                [],
-                ['inspace.blob', 'inspace.ipynb', 'inspace.txt'],
-            ),
-            (
-                'foo',
-                ['bar'],
-                [
-                    'a.blob', 'a.ipynb', 'a.txt',
-                    'b.blob', 'b.ipynb', 'b.txt',
-                    'name with spaces.blob',
-                    'name with spaces.ipynb',
-                    'name with spaces.txt',
-                    u'unicodé.blob', u'unicodé.ipynb', u'unicodé.txt'
-                ]
-            ),
-            (
-                'foo/bar',
-                [],
-                ['baz.blob', 'baz.ipynb', 'baz.txt'],
-            ),
-            (
-                'ordering',
-                [],
-                [
-                    'A.blob', 'A.ipynb', 'A.txt',
-                    'C.blob', 'C.ipynb', 'C.txt',
-                    'b.blob', 'b.ipynb', 'b.txt',
-                ],
-            ),
-            (
-                u'unicodé',
-                [],
-                ['innonascii.blob', 'innonascii.ipynb', 'innonascii.txt'],
-            ),
-            (
-                u'å b',
-                [],
-                [u'ç d.blob', u'ç d.ipynb', u'ç d.txt'],
-            ),
-        ]
-
-        for idx, (dname, subdirs, files) in enumerate(expected):
-            result_dname, result_subdirs, result_files = results[idx]
-            if dname == '':
-                sep = ''
-            else:
-                sep = '/'
-            self.assertEqual(
-                dname,
-                result_dname,
-            )
-            self.assertEqual(
-                [sep.join([dname, sub]) for sub in subdirs],
-                result_subdirs,
-            )
-            self.assertEqual(
-                [sep.join([dname, fname]) for fname in files],
-                result_files,
-            )