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

Source/modules/speech/SpeechRecognitionResultList.h

Index: Source/modules/speech/SpeechRecognitionResultList.h
diff --git a/Source/modules/speech/SpeechRecognitionResultList.h b/Source/modules/speech/SpeechRecognitionResultList.h
index 39b99f30e79982ac0abb7d9c942ea18faf17cc53..63732b7c38c0cff970bd800eeb24975e8716e3f0 100644
--- a/Source/modules/speech/SpeechRecognitionResultList.h
+++ b/Source/modules/speech/SpeechRecognitionResultList.h
@@ -37,8 +37,8 @@ class SpeechRecognitionResultList : public GarbageCollected<SpeechRecognitionRes
 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*);