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

Source/core/dom/Event.idl

Index: Source/core/dom/Event.idl
diff --git a/Source/core/dom/Event.idl b/Source/core/dom/Event.idl
index 8da189408fa4cbc7ecd5677f4a12cb5b6d7121d8..74af6e13cbde35c684c858bea81ebfb065fd1998 100644
--- a/Source/core/dom/Event.idl
+++ b/Source/core/dom/Event.idl
@@ -22,7 +22,7 @@
 [
     CustomToV8,
     ConstructorTemplate=Event
-    
+
 ] interface Event {
 
     // DOM PhaseType
@@ -59,8 +59,8 @@
 
     void               stopPropagation();
     void               preventDefault();
-     void initEvent([Default=Undefined] optional DOMString eventTypeArg, 
-                                  [Default=Undefined] optional boolean canBubbleArg, 
+     void initEvent([Default=Undefined] optional DOMString eventTypeArg,
+                                  [Default=Undefined] optional boolean canBubbleArg,
                                   [Default=Undefined] optional boolean cancelableArg);
 
     // DOM Level 3 Additions.