Fix trailing whitespace in .cpp, .h, and .idl files

Source/core/dom/EventListener.h

Index: Source/core/dom/EventListener.h
diff --git a/Source/core/dom/EventListener.h b/Source/core/dom/EventListener.h
index 768a0c323532e997bb2c54299566554140a64d1c..33c4a34856a542169d7b69361f2b7a000507b182 100644
--- a/Source/core/dom/EventListener.h
+++ b/Source/core/dom/EventListener.h
@@ -32,8 +32,8 @@ namespace WebCore {
     class EventListener : public RefCounted<EventListener> {
     public:
         enum Type {
-            JSEventListenerType, 
-            ImageEventListenerType, 
+            JSEventListenerType,
+            ImageEventListenerType,
             ObjCEventListenerType,
             CPPEventListenerType,
             ConditionEventListenerType,
@@ -59,7 +59,7 @@ namespace WebCore {
 
     private:
         virtual bool virtualisAttribute() const { return false; }
-        
+
         Type m_type;
     };