Clean up *.in files related to DOM exceptions and events

Source/core/scripts/make_event_factory.py

Index: Source/core/scripts/make_event_factory.py
diff --git a/Source/core/scripts/make_event_factory.py b/Source/core/scripts/make_event_factory.py
index cf6790ac2353295266861eb3a2f68b0529db0c38..06d0880fa151e940ec5b7c980809089ed0c054e4 100644
--- a/Source/core/scripts/make_event_factory.py
+++ b/Source/core/scripts/make_event_factory.py
@@ -57,8 +57,7 @@ PassRefPtr<%(class_name)s> %(class_name)sFactory::create(const String& type)
 
 class EventFactoryWriter(name_macros.Writer):
     defaults = {
-        'JSInterfaceName': None,
-        'interfaceName': None,
+        'implementedAs': None,
         'conditional': None,
         'runtimeConditional': None,
     }
@@ -78,12 +77,12 @@ class EventFactoryWriter(name_macros.Writer):
         if event['runtimeConditional']:
             runtime_condition = ' && RuntimeEnabledFeatures::' + event['runtimeConditional'] + '()'
         name = os.path.basename(event['name'])
-        interface_name = event['interfaceName'] if event['interfaceName'] else name
+        class_name = self._class_name_for_entry(event)
         implementation = """    if (type == "%(name)s"%(runtime_condition)s)
-        return %(interface_name)s::create();""" % {
+        return %(class_name)s::create();""" % {
             'name': name,
             'runtime_condition': runtime_condition,
-            'interface_name': interface_name,
+            'class_name': class_name,
         }
         return self.wrap_with_condition(implementation, event['conditional'])