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

Source/core/css/CSSMediaRule.idl

Index: Source/core/css/CSSMediaRule.idl
diff --git a/Source/core/css/CSSMediaRule.idl b/Source/core/css/CSSMediaRule.idl
index b1ea13a5d858a8c89f99f64f2b61103884fb856b..71185a7ba1368c040bf31427f6c3561f344e8853 100644
--- a/Source/core/css/CSSMediaRule.idl
+++ b/Source/core/css/CSSMediaRule.idl
@@ -22,8 +22,8 @@
 interface CSSMediaRule : CSSRule {
     readonly attribute MediaList media;
     readonly attribute CSSRuleList cssRules;
-    
-     [RaisesException] unsigned long      insertRule([Default=Undefined] optional DOMString rule, 
+
+     [RaisesException] unsigned long      insertRule([Default=Undefined] optional DOMString rule,
                                                  [Default=Undefined] optional unsigned long index);
     [RaisesException] void               deleteRule([Default=Undefined] optional unsigned long index);
 };