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

Source/core/dom/KeyboardEvent.idl

Index: Source/core/dom/KeyboardEvent.idl
diff --git a/Source/core/dom/KeyboardEvent.idl b/Source/core/dom/KeyboardEvent.idl
index 134cb59c34afe583ffa6370a6385b796b8ca18f0..cda219fa046a5e9267bf90a8bc30adc1e560042e 100644
--- a/Source/core/dom/KeyboardEvent.idl
+++ b/Source/core/dom/KeyboardEvent.idl
@@ -31,10 +31,10 @@
     readonly attribute boolean          altGraphKey;
 
     // FIXME: this does not match the version in the DOM spec.
-    void initKeyboardEvent([Default=Undefined] optional DOMString type, 
-                           [Default=Undefined] optional boolean canBubble, 
-                           [Default=Undefined] optional boolean cancelable, 
-                           [Default=Undefined] optional Window view, 
+    void initKeyboardEvent([Default=Undefined] optional DOMString type,
+                           [Default=Undefined] optional boolean canBubble,
+                           [Default=Undefined] optional boolean cancelable,
+                           [Default=Undefined] optional Window view,
                            [Default=Undefined] optional DOMString keyIdentifier,
                            [Default=Undefined] optional unsigned long keyLocation,
                            [Default=Undefined] optional boolean ctrlKey,