Remove unnecessary renames from dartdomgenerator.py.

lib/dom/scripts/databasebuilder.py

Index: lib/dom/scripts/databasebuilder.py
diff --git a/lib/dom/scripts/databasebuilder.py b/lib/dom/scripts/databasebuilder.py
index a1817eccf99da2c38b49239594047a57f84f60e1..0dc2ce18bd074d52b078a3398f585e84ee1343b0 100755
--- a/lib/dom/scripts/databasebuilder.py
+++ b/lib/dom/scripts/databasebuilder.py
@@ -406,11 +406,6 @@ class DatabaseBuilder(object):
     _logger.info('merging impl stmt %s implements %s' %
                  (implementor_name, implemented_name))
 
-    if implementor_name == implemented_name:
-      # After renaming, this might happen (e.g. Window impls
-      # AbstractView, but AbstractView was renamed to Window).
-      return
-
     source = import_options.source
     if self._database.HasInterface(implementor_name):
       interface = self._database.GetInterface(implementor_name)