Fix cookiejar_and_cache move.

tests/helpers/stubs.py

@@ -33,6 +33,8 @@ from qutebrowser.config import configexc
 
 class FakeNetworkCache(QAbstractNetworkCache):
 
+    """Fake cache with no data."""
+
     def cacheSize(self):
         return 0
 

tests/unit/browser/test_commands.py

@@ -22,8 +22,6 @@
 import collections
 
 import pytest
-from PyQt5.QtNetwork import (QNetworkCookieJar, QAbstractNetworkCache,
-                             QNetworkCacheMetaData)
 
 from qutebrowser.browser import commands
 from qutebrowser.mainwindow import tabbedbrowser
@@ -36,18 +34,6 @@ ObjectsRet = collections.namedtuple('Dispatcher', ['tb', 'cd'])
 pytestmark = pytest.mark.usefixtures('cookiejar_and_cache')
 
 
-@pytest.yield_fixture(autouse=True)
-def cookiejar_and_cache():
-    """Fixture providing a fake cookie jar and cache."""
-    jar = QNetworkCookieJar()
-    cache = FakeNetworkCache()
-    objreg.register('cookie-jar', jar)
-    objreg.register('cache', cache)
-    yield
-    objreg.delete('cookie-jar')
-    objreg.delete('cache')
-
-
 @pytest.yield_fixture
 def objects(qtbot, default_config, key_config_stub, tab_registry,
             host_blocker_stub):