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

Source/core/dom/DOMImplementation.h

Index: Source/core/dom/DOMImplementation.h
diff --git a/Source/core/dom/DOMImplementation.h b/Source/core/dom/DOMImplementation.h
index 14dcdf7957dcc069746a03ad885c4292092ec399..e09ff6e12ac9746bade6552106bb4eee6b3e8c34 100644
--- a/Source/core/dom/DOMImplementation.h
+++ b/Source/core/dom/DOMImplementation.h
@@ -43,7 +43,7 @@ class DOMImplementation : public ScriptWrappable {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     static PassOwnPtr<DOMImplementation> create(Document* document) { return adoptPtr(new DOMImplementation(document)); }
-    
+
     void ref() { m_document->ref(); }
     void deref() { m_document->deref(); }
     Document* document() { return m_document; }