Extract ExtensionFunctionRegistry from ExtensionFunctionDispatcher.

tools/json_schema_compiler/h_generator.py

Index: tools/json_schema_compiler/h_generator.py
diff --git a/tools/json_schema_compiler/h_generator.py b/tools/json_schema_compiler/h_generator.py
index 3c97bc62ef68688162ec1756a4b0bed3a6969471..dfc99cbea489a9f0d4f26938a8231fe60685f783 100644
--- a/tools/json_schema_compiler/h_generator.py
+++ b/tools/json_schema_compiler/h_generator.py
@@ -27,7 +27,8 @@ class HGenerator(object):
       .Append()
     )
 
-    ifndef_name = self._GenerateIfndefName()
+    ifndef_name = cpp_util.GenerateIfndefName(self._namespace.source_file_dir,
+                                              self._target_namespace)
     (c.Append('#ifndef %s' % ifndef_name)
       .Append('#define %s' % ifndef_name)
       .Append('#pragma once')
@@ -263,13 +264,3 @@ class HGenerator(object):
     c.Eblock('};')
 
     return c
-
-  def _GenerateIfndefName(self):
-    """Formats a path and filename as a #define name.
-
-    e.g chrome/extensions/gen, file.h becomes CHROME_EXTENSIONS_GEN_FILE_H__.
-    """
-    return (('%s_%s_H__' %
-        (self._namespace.source_file_dir, self._target_namespace))
-        .upper().replace(os.sep, '_'))
-