Use "unsigned" rather than "unsigned long" for C++ code interacting with WebIDL's "unsigned long".

Source/modules/speech/SpeechRecognitionResultList.h

 /*
  * Copyright (C) 2012 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 19 matching lines @@
 #include "modules/speech/SpeechRecognitionResult.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SpeechRecognitionResultList : public GarbageCollected<SpeechRecognitionResultList>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static SpeechRecognitionResultList* create(const HeapVector<Member<SpeechRecognitionResult> >&);
 
-    unsigned long length() { return m_results.size(); }
-    SpeechRecognitionResult* item(unsigned long index);
+    unsigned length() { return m_results.size(); }
+    SpeechRecognitionResult* item(unsigned index);
 
     void trace(Visitor*);
 
 private:
     explicit SpeechRecognitionResultList(const HeapVector<Member<SpeechRecognitionResult> >&);
 
     HeapVector<Member<SpeechRecognitionResult> > m_results;
 };
 
 } // namespace blink
 
 #endif // SpeechRecognitionResultList_h