Clean up V8 bindings template code

third_party/WebKit/Source/bindings/scripts/v8_utilities.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 94 matching lines @@
     """Uncapitalizes first letter or initial acronym (used in method names).
 
     E.g., 'SetURL' becomes 'setURL', but 'URLFoo' becomes 'urlFoo'.
     """
     for acronym in ACRONYMS:
         if name.startswith(acronym):
             return name.replace(acronym, acronym.lower())
     return name[0].lower() + name[1:]
 
 
+def unique_by(dict_list, key):
+    """Returns elements from a list of dictionaries with unique values for the named key."""
+    keys_seen = set()
+    filtered_list = []
+    for item in dict_list:
+        if item.get(key) not in keys_seen:
+            filtered_list.append(item)
+            keys_seen.add(item.get(key))
+    return filtered_list
+
+
 ################################################################################
 # C++
 ################################################################################
 
 def scoped_name(interface, definition, base_name):
     if 'ImplementedInPrivateScript' in definition.extended_attributes:
         return '%s::PrivateScript::%s' % (v8_class_name(interface), base_name)
     # partial interfaces are implemented as separate classes, with their members
     # implemented as static member functions
     partial_interface_implemented_as = definition.extended_attributes.get('PartialInterfaceImplementedAs')
@@ skipping 483 matching lines @@
     except StopIteration:
         return None
 
 
 IdlInterface.indexed_property_getter = property(indexed_property_getter)
 IdlInterface.indexed_property_setter = property(indexed_property_setter)
 IdlInterface.indexed_property_deleter = property(indexed_property_deleter)
 IdlInterface.named_property_getter = property(named_property_getter)
 IdlInterface.named_property_setter = property(named_property_setter)
 IdlInterface.named_property_deleter = property(named_property_deleter)