Implement platform deleters per spec.

Source/bindings/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. 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.
@@ skipping 678 matching lines @@
 
     // Can only be called by blink::initialize
     void setMainThreadIsolate(v8::Isolate*);
 
     // Converts a DOM object to a v8 value.
     // This is a no-inline version of toV8(). If you want to call toV8()
     // without creating #include cycles, you can use this function instead.
     // Each specialized implementation will be generated.
     template<typename T>
     v8::Handle<v8::Value> toV8NoInline(T* impl, v8::Handle<v8::Object> creationContext, v8::Isolate*);
+
+    // Result values for platform object 'deleter' methods,
+    // http://www.w3.org/TR/WebIDL/#delete
+    enum DeleteResult {
+        DeleteSuccess,
+        DeleteReject,
+        DeleteUnknownProperty
+    };
 } // namespace WebCore
 
 #endif // V8Binding_h