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

Source/core/dom/HashChangeEvent.idl

Index: Source/core/dom/HashChangeEvent.idl
diff --git a/Source/core/dom/HashChangeEvent.idl b/Source/core/dom/HashChangeEvent.idl
index 2408afe6dc638a850569fd2eb1f32fe4bd84ea5c..470a2083c726cf802f6333d0af344f85cafa973b 100644
--- a/Source/core/dom/HashChangeEvent.idl
+++ b/Source/core/dom/HashChangeEvent.idl
@@ -21,11 +21,11 @@
 [
     ConstructorTemplate=Event
 ] interface HashChangeEvent : Event {
-    void initHashChangeEvent([Default=Undefined] optional DOMString type, 
-                             [Default=Undefined] optional boolean canBubble, 
-                             [Default=Undefined] optional boolean cancelable, 
-                             [Default=Undefined] optional DOMString oldURL, 
-                             [Default=Undefined] optional DOMString newURL); 
+    void initHashChangeEvent([Default=Undefined] optional DOMString type,
+                             [Default=Undefined] optional boolean canBubble,
+                             [Default=Undefined] optional boolean cancelable,
+                             [Default=Undefined] optional DOMString oldURL,
+                             [Default=Undefined] optional DOMString newURL);
     [InitializedByEventConstructor] readonly attribute DOMString oldURL;
     [InitializedByEventConstructor] readonly attribute DOMString newURL;
 };