Remove the dependency on json schema compiler.

tools/json_schema_compiler/highlighters/none_highlighter.py

Index: tools/json_schema_compiler/highlighters/none_highlighter.py
diff --git a/tools/json_schema_compiler/highlighters/none_highlighter.py b/tools/json_schema_compiler/highlighters/none_highlighter.py
deleted file mode 100644
index ac1cc2b4b2684e32e28efb33da9c8b8a527a1391..0000000000000000000000000000000000000000
--- a/tools/json_schema_compiler/highlighters/none_highlighter.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-import cgi
-
-class NoneHighlighter(object):
-  """Highlighter that just wraps code in a <pre>.
-  """
-  def GetCSS(self, style):
-    return ''
-
-  def GetCodeElement(self, code, style):
-    return '<pre>' + cgi.escape(code) + '</pre>'
-
-  def DisplayName(self):
-    return 'none'
-
-  def GetStyles(self):
-    return []