Use dictionaries for context creation attributes. Eliminate custom bindings.

Source/bindings/templates/dictionary_v8.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by {{code_generator}}. DO NOT MODIFY!
 
 #include "config.h"
 #include "{{v8_original_class}}.h"
 
 {% for filename in cpp_includes if filename != '%s.h' % v8_class %}
 #include "{{filename}}"
 {% endfor %}
 
 namespace blink {
 
 {% macro convert_and_set_member(member) %}
 {% endmacro %}
 void {{v8_class}}::toImpl(v8::Isolate* isolate, v8::Handle<v8::Value> v8Value, {{cpp_class}}& impl, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(v8Value))
         return;
     if (!v8Value->IsObject()) {
+        {% if use_permissive_dictionary_conversion %}
+        // Do nothing.
+        {% else %}
         exceptionState.throwTypeError("cannot convert to dictionary.");
+        {% endif %}
         return;
     }
 
     {% if parent_v8_class %}
     {{parent_v8_class}}::toImpl(isolate, v8Value, impl, exceptionState);
     if (exceptionState.hadException())
         return;
 
     {% endif %}
     {# Declare local variables only when the dictionary has members to avoid unused variable warnings. #}
@@ skipping 70 matching lines @@
 }
 
 {{cpp_class}} NativeValueTraits<{{cpp_class}}>::nativeValue(const v8::Handle<v8::Value>& value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     {{cpp_class}} impl;
     {{v8_class}}::toImpl(isolate, value, impl, exceptionState);
     return impl;
 }
 
 } // namespace blink