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

Source/core/dom/MutationEvent.idl

Index: Source/core/dom/MutationEvent.idl
diff --git a/Source/core/dom/MutationEvent.idl b/Source/core/dom/MutationEvent.idl
index 16c183ed96c6fceebda38e29720a8de5144dd57b..0aae4e31df94247d75cf26a374294aae883f39cc 100644
--- a/Source/core/dom/MutationEvent.idl
+++ b/Source/core/dom/MutationEvent.idl
@@ -31,13 +31,13 @@ interface MutationEvent : Event {
     readonly attribute DOMString      attrName;
     readonly attribute unsigned short attrChange;
 
-     void initMutationEvent([Default=Undefined] optional DOMString type, 
-                                          [Default=Undefined] optional boolean canBubble, 
-                                          [Default=Undefined] optional boolean cancelable, 
-                                          [Default=Undefined] optional Node relatedNode, 
-                                          [Default=Undefined] optional DOMString prevValue, 
-                                          [Default=Undefined] optional DOMString newValue, 
-                                          [Default=Undefined] optional DOMString attrName, 
+     void initMutationEvent([Default=Undefined] optional DOMString type,
+                                          [Default=Undefined] optional boolean canBubble,
+                                          [Default=Undefined] optional boolean cancelable,
+                                          [Default=Undefined] optional Node relatedNode,
+                                          [Default=Undefined] optional DOMString prevValue,
+                                          [Default=Undefined] optional DOMString newValue,
+                                          [Default=Undefined] optional DOMString attrName,
                                           [Default=Undefined] optional unsigned short attrChange);
 
 };