Code problems detected by cppcheck

Source/platform/exported/WebString.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 103 matching lines @@
 {
     return String(data, length);
 }
 
 bool WebString::equals(const WebString& s) const
 {
     return equal(m_private.get(), s.m_private.get());
 }
 
 WebString::WebString(const WTF::String& s)
+    : m_private(s.impl())
 {
-    m_private = s.impl();
 }
 
 WebString& WebString::operator=(const WTF::String& s)
 {
     assign(s.impl());
     return *this;
 }
 
 WebString::operator WTF::String() const
 {
@@ skipping 15 matching lines @@
 {
     return WTF::AtomicString(m_private.get());
 }
 
 void WebString::assign(WTF::StringImpl* p)
 {
     m_private = p;
 }
 
 } // namespace blink