Remove dead code

I wrote this code because we had a traceback at some point with pyyaml
not able to handle our AnsibleUnicode type (the C library was doing an
exact match to python's unicode type rather than testing with the object
inheritance hierarchy.) Neither jimi think that AnsibleUnicode gets
passed into this function anymore, though, so we think it is safe to remove.

lib/ansible/parsing/utils/yaml.py

@@ -16,7 +16,7 @@ from ansible.errors.yaml_strings import YAML_SYNTAX_ERROR
 from ansible.module_utils.six import text_type
 from ansible.module_utils._text import to_native
 from ansible.parsing.yaml.loader import AnsibleLoader
-from ansible.parsing.yaml.objects import AnsibleBaseYAMLObject, AnsibleUnicode
+from ansible.parsing.yaml.objects import AnsibleBaseYAMLObject
 
 
 __all__ = ('from_yaml',)
@@ -61,31 +61,15 @@ def from_yaml(data, file_name='<string>', show_content=True, vault_secrets=None)
     '''
     new_data = None
 
-    if isinstance(data, AnsibleUnicode):
-        # The PyYAML's libyaml bindings use PyUnicode_CheckExact so
-        # they are unable to cope with our subclass.
-        # Unwrap and re-wrap the unicode so we can keep track of line
-        # numbers
-        # Note: Cannot use to_text() because AnsibleUnicode is a subclass of the text_type.
-        # Should not have to worry about tracebacks because python's text constructors (unicode() on
-        # python2 and str() on python3) can handle a subtype of themselves.
-        in_data = text_type(data)
-    else:
-        in_data = data
-
     try:
         # we first try to load this data as JSON.  Fixes issues with extra vars json strings not
         # being parsed correctly by the yaml parser
-        new_data = json.loads(in_data)
+        new_data = json.loads(data)
     except Exception:
         # must not be JSON, let the rest try
         try:
-            new_data = _safe_load(in_data, file_name=file_name, vault_secrets=vault_secrets)
+            new_data = _safe_load(data, file_name=file_name, vault_secrets=vault_secrets)
         except YAMLError as yaml_exc:
             _handle_error(yaml_exc, file_name, show_content)
 
-        if isinstance(data, AnsibleUnicode):
-            new_data = AnsibleUnicode(new_data)
-            new_data.ansible_pos = data.ansible_pos
-
     return new_data