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

Source/core/dom/UIEvent.idl

Index: Source/core/dom/UIEvent.idl
diff --git a/Source/core/dom/UIEvent.idl b/Source/core/dom/UIEvent.idl
index 09960d7731463c44a97a594111cc3850171a6a96..bfa6da92568bf7fe1c74a4b7174ae65de3e027d6 100644
--- a/Source/core/dom/UIEvent.idl
+++ b/Source/core/dom/UIEvent.idl
@@ -22,11 +22,11 @@
 ] interface UIEvent : Event {
     [InitializedByEventConstructor] readonly attribute Window view;
     [InitializedByEventConstructor] readonly attribute long detail;
-    
-     void initUIEvent([Default=Undefined] optional DOMString type, 
-                                    [Default=Undefined] optional boolean canBubble, 
-                                    [Default=Undefined] optional boolean cancelable, 
-                                    [Default=Undefined] optional Window view, 
+
+     void initUIEvent([Default=Undefined] optional DOMString type,
+                                    [Default=Undefined] optional boolean canBubble,
+                                    [Default=Undefined] optional boolean cancelable,
+                                    [Default=Undefined] optional Window view,
                                     [Default=Undefined] optional long detail);
 
     // extensions