Remove code that was only used by navigator.connect.

third_party/WebKit/Source/core/dom/MessagePort.cpp

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 255 matching lines @@
     }
     return portArray;
 }
 
 DEFINE_TRACE(MessagePort)
 {
     ActiveDOMObject::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 
-v8::Isolate* MessagePort::scriptIsolate()
-{
-    DCHECK(getExecutionContext());
-    return toIsolate(getExecutionContext());
-}
-
-v8::Local<v8::Context> MessagePort::scriptContextForMessageConversion()
-{
-    DCHECK(getExecutionContext());
-    if (!m_scriptStateForConversion) {
-        v8::Isolate* isolate = scriptIsolate();
-        m_scriptStateForConversion = ScriptState::create(v8::Context::New(isolate), DOMWrapperWorld::create(isolate));
-    }
-    return m_scriptStateForConversion->context();
-}
-
 } // namespace blink