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

Source/modules/speech/SpeechRecognitionResultList.cpp

Index: Source/modules/speech/SpeechRecognitionResultList.cpp
diff --git a/Source/modules/speech/SpeechRecognitionResultList.cpp b/Source/modules/speech/SpeechRecognitionResultList.cpp
index 7a08fb8ebb165c0014d005c541d26dbb83971dfe..6373c0d88d8114e2f5734e5cfe884eb4a541dc50 100644
--- a/Source/modules/speech/SpeechRecognitionResultList.cpp
+++ b/Source/modules/speech/SpeechRecognitionResultList.cpp
@@ -34,7 +34,7 @@ SpeechRecognitionResultList* SpeechRecognitionResultList::create(const HeapVecto
     return new SpeechRecognitionResultList(results);
 }
 
-SpeechRecognitionResult* SpeechRecognitionResultList::item(unsigned long index)
+SpeechRecognitionResult* SpeechRecognitionResultList::item(unsigned index)
 {
     if (index >= m_results.size())
         return 0;