make_names.py: Drop support of namespace fields including capital letters

Bug: 889726
Change-Id: I7994d14f8651f0ebcacc4e7485eabe4f28379dea
Reviewed-on: https://chromium-review.googlesource.com/c/1317419Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605494}

third_party/blink/renderer/build/scripts/make_names.py

@@ -37,15 +37,6 @@ import template_expander
 import name_utilities
 
 
-def _legacy_symbol(entry):
-    if entry['Symbol'] is not None:
-        return entry['Symbol']
-    # FIXME: Remove this special case for the ugly x-webkit-foo attributes.
-    if entry['name'].original.startswith('-webkit-'):
-        return entry['name'].original.replace('-', '_')[1:]
-    return name_utilities.cpp_name(entry).replace('-', '_').replace(' ', '_')
-
-
 def _symbol(entry):
     if entry['Symbol'] is not None:
         return entry['Symbol']
@@ -70,7 +61,6 @@ class MakeNamesWriter(json5_generator.Writer):
     filters = {
         'cpp_name': name_utilities.cpp_name,
         'hash': hasher.hash,
-        'script_name': name_utilities.script_name,
         'symbol': _symbol,
     }
 
@@ -81,12 +71,13 @@ class MakeNamesWriter(json5_generator.Writer):
         suffix = self.json5_file.metadata['suffix'].strip('"')
         export = self.json5_file.metadata['export'].strip('"')
 
-        assert namespace, 'A namespace is required.'
-        # TODO(tkent): Remove the following condition.  Namespace fields of all
-        # foo_names.json5 should be lower-cased.  crbug.com/889726
+        if not namespace:
+            raise ValueError('A namespace is required.')
+        # https://google.github.io/styleguide/cppguide.html#Namespace_Names
         if namespace.lower() != namespace:
-            namespace = namespace + 'Names'
-            MakeNamesWriter.filters['symbol'] = _legacy_symbol
+            raise ValueError('The namespace field should be lower-cased. ' +
+                             '"%s" is specified in %s.' %
+                             (namespace, json5_file_path))
 
         basename, _ = os.path.splitext(os.path.basename(json5_file_path[0]))
         self._outputs = {