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

Source/modules/speech/SpeechSynthesisEvent.cpp

Index: Source/modules/speech/SpeechSynthesisEvent.cpp
diff --git a/Source/modules/speech/SpeechSynthesisEvent.cpp b/Source/modules/speech/SpeechSynthesisEvent.cpp
index ebf1036969a6c3da220c897a99e358215b8730d9..05ee1d1bdc8e91e4fe59fb293cdb541df92c48f0 100644
--- a/Source/modules/speech/SpeechSynthesisEvent.cpp
+++ b/Source/modules/speech/SpeechSynthesisEvent.cpp
@@ -33,7 +33,7 @@ PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> SpeechSynthesisEvent::create()
     return adoptRefWillBeNoop(new SpeechSynthesisEvent);
 }
 
-PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> SpeechSynthesisEvent::create(const AtomicString& type, unsigned long charIndex, float elapsedTime, const String& name)
+PassRefPtrWillBeRawPtr<SpeechSynthesisEvent> SpeechSynthesisEvent::create(const AtomicString& type, unsigned charIndex, float elapsedTime, const String& name)
 {
     return adoptRefWillBeNoop(new SpeechSynthesisEvent(type, charIndex, elapsedTime, name));
 }
@@ -42,7 +42,7 @@ SpeechSynthesisEvent::SpeechSynthesisEvent()
 {
 }
 
-SpeechSynthesisEvent::SpeechSynthesisEvent(const AtomicString& type, unsigned long charIndex, float elapsedTime, const String& name)
+SpeechSynthesisEvent::SpeechSynthesisEvent(const AtomicString& type, unsigned charIndex, float elapsedTime, const String& name)
     : Event(type, false, false)
     , m_charIndex(charIndex)
     , m_elapsedTime(elapsedTime)