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

Source/core/css/CSSSelector.h

Index: Source/core/css/CSSSelector.h
diff --git a/Source/core/css/CSSSelector.h b/Source/core/css/CSSSelector.h
index 5aa125a73d930dd5a412a34def98b3bb752f3120..2e562621c8e2f25323a986bb1f0ade86125ce66d 100644
--- a/Source/core/css/CSSSelector.h
+++ b/Source/core/css/CSSSelector.h
@@ -267,7 +267,7 @@ namespace WebCore {
             QualifiedName m_attribute; // used for attribute selector
             AtomicString m_argument; // Used for :contains, :lang and :nth-*
             OwnPtr<CSSSelectorList> m_selectorList; // Used for :-webkit-any and :not
-        
+
         private:
             RareData(PassRefPtr<StringImpl> value);
         };