Implement platform deleters per spec.

Source/bindings/tests/results/V8TestEventTarget.cpp

 /*
  * 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
@@ skipping 197 matching lines @@
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMNamedProperty");
     TestEventTargetV8Internal::namedPropertySetter(name, jsValue, info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 
 static void namedPropertyDeleter(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Boolean>& info)
 {
     TestEventTarget* collection = V8TestEventTarget::toNative(info.Holder());
     AtomicString propertyName = toCoreAtomicString(name);
-    bool result = collection->anonymousNamedDeleter(propertyName);
-    return v8SetReturnValueBool(info, result);
+    bool result = true;
+    bool knownProperty = collection->anonymousNamedDeleter(propertyName, result);
+    if (knownProperty)
+        return v8SetReturnValueBool(info, result);
 }
 
 static void namedPropertyDeleterCallback(v8::Local<v8::String> name, const v8::PropertyCallbackInfo<v8::Boolean>& info)
 {
     TRACE_EVENT_SET_SAMPLING_STATE("Blink", "DOMNamedProperty");
     TestEventTargetV8Internal::namedPropertyDeleter(name, info);
     TRACE_EVENT_SET_SAMPLING_STATE("V8", "Execution");
 }
 
 static void namedPropertyEnumerator(const v8::PropertyCallbackInfo<v8::Array>& info)
@@ skipping 121 matching lines @@
     fromInternalPointer(object)->deref();
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline(TestEventTarget* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 } // namespace WebCore