bpo-36675: Remove obsolete code. (GH-16024)

Does no longer work since Sphinx moved the trim_doctest_flag option in
the configuration.

Doc/library/doctest.rst

-:keepdoctest:
-
 :mod:`doctest` --- Test interactive Python examples
 ===================================================
 

Doc/tools/extensions/pyspecific.py

@@ -29,7 +29,6 @@ except ImportError:
 from sphinx.locale import translators
 from sphinx.util import status_iterator, logging
 from sphinx.util.nodes import split_explicit_title
-from sphinx.writers.html import HTMLTranslator
 from sphinx.writers.text import TextWriter, TextTranslator
 from sphinx.writers.latex import LaTeXTranslator
 from sphinx.domains.python import PyModulelevel, PyClassmember
@@ -49,37 +48,6 @@ Body.enum.converters['loweralpha'] = \
     Body.enum.converters['lowerroman'] = \
     Body.enum.converters['upperroman'] = lambda x: None
 
-# monkey-patch HTML and LaTeX translators to keep doctest blocks in the
-# doctest docs themselves
-orig_visit_literal_block = HTMLTranslator.visit_literal_block
-orig_depart_literal_block = LaTeXTranslator.depart_literal_block
-
-
-def new_visit_literal_block(self, node):
-    meta = self.builder.env.metadata[self.builder.current_docname]
-    old_trim_doctest_flags = self.highlighter.trim_doctest_flags
-    if 'keepdoctest' in meta:
-        self.highlighter.trim_doctest_flags = False
-    try:
-        orig_visit_literal_block(self, node)
-    finally:
-        self.highlighter.trim_doctest_flags = old_trim_doctest_flags
-
-
-def new_depart_literal_block(self, node):
-    meta = self.builder.env.metadata[self.curfilestack[-1]]
-    old_trim_doctest_flags = self.highlighter.trim_doctest_flags
-    if 'keepdoctest' in meta:
-        self.highlighter.trim_doctest_flags = False
-    try:
-        orig_depart_literal_block(self, node)
-    finally:
-        self.highlighter.trim_doctest_flags = old_trim_doctest_flags
-
-
-HTMLTranslator.visit_literal_block = new_visit_literal_block
-LaTeXTranslator.depart_literal_block = new_depart_literal_block
-
 
 # Support for marking up and linking to bugs.python.org issues