Docserver: there is only one.

chrome/common/extensions/docs/server2/compiled_file_system.py

Index: chrome/common/extensions/docs/server2/compiled_file_system.py
diff --git a/chrome/common/extensions/docs/server2/compiled_file_system.py b/chrome/common/extensions/docs/server2/compiled_file_system.py
index 087eea8a08761efd4b172fc80181f7a45b8555d6..29b1363abaf3794a7e1e76733affcc372409ab07 100644
--- a/chrome/common/extensions/docs/server2/compiled_file_system.py
+++ b/chrome/common/extensions/docs/server2/compiled_file_system.py
@@ -26,12 +26,12 @@ class CompiledFileSystem(object):
       """
       assert isinstance(cls, type)
       assert not cls.__name__[0].islower()  # guard against non-class types
-      full_name = cls.__name__
+      full_name = [cls.__name__, self._file_system.GetIdentity()]
       if category is not None:
-        full_name = '%s/%s' % (full_name, category)
-      def create_object_store(category):
+        full_name.append(category)
+      def create_object_store(my_category):
         return self._object_store_creator.Create(
-            CompiledFileSystem, category='%s/%s' % (full_name, category))
+            CompiledFileSystem, category='/'.join(full_name + [my_category]))
       return CompiledFileSystem(self._file_system,
                                 populate_function,
                                 create_object_store('file'),