bindings: Retires V8T::toEventTarget and reduces the binary size.

Source/bindings/templates/interface.h

 // 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!
 
 #ifndef {{v8_class}}_h
 #define {{v8_class}}_h
 
 {% filter conditional(conditional_string) %}
@@ skipping 59 matching lines @@
         visitor->trace(scriptWrappableBase->toImpl<{{cpp_class}}>());
 #endif
         {% endif %}
     }
     {% if has_visit_dom_wrapper %}
     static void visitDOMWrapper(v8::Isolate*, ScriptWrappableBase*, const v8::Persistent<v8::Object>&);
     {% endif %}
     {% if is_active_dom_object %}
     static ActiveDOMObject* toActiveDOMObject(v8::Handle<v8::Object>);
     {% endif %}
-    {% if is_event_target %}
-    static EventTarget* toEventTarget(v8::Handle<v8::Object>);
-    {% endif %}
     {% if interface_name == 'Window' %}
     static v8::Handle<v8::ObjectTemplate> getShadowObjectTemplate(v8::Isolate*);
     {% endif %}
     {% for method in methods %}
     {% if method.is_custom %}
     {% filter conditional(method.conditional_string) %}
     static void {{method.name}}MethodCustom(const v8::FunctionCallbackInfo<v8::Value>&);
     {% endfilter %}
     {% endif %}
     {% endfor %}
@@ skipping 111 matching lines @@
 
 {% endif %}{# has_custom_to_v8 #}
 {% if has_event_constructor %}
 bool initialize{{cpp_class}}({{cpp_class}}Init&, const Dictionary&, ExceptionState&, const v8::FunctionCallbackInfo<v8::Value>& info);
 
 {% endif %}
 } // namespace blink
 {% endfilter %}
 
 #endif // {{v8_class}}_h