Add a move constructor and move assignment operator to KURL

Source/platform/weborigin/KURL.h

Index: Source/platform/weborigin/KURL.h
diff --git a/Source/platform/weborigin/KURL.h b/Source/platform/weborigin/KURL.h
index ac6d23165a9c654dd697fdb4ca090405288c432c..0521ce47a164b2fc89620a6da4fbc97952f6ee39 100644
--- a/Source/platform/weborigin/KURL.h
+++ b/Source/platform/weborigin/KURL.h
@@ -55,6 +55,11 @@ public:
     KURL(const KURL&);
     KURL& operator=(const KURL&);
 
+#if COMPILER_SUPPORTS(CXX_RVALUE_REFERENCES)
+    KURL(KURL&&);
+    KURL& operator=(KURL&&);
+#endif
+
     // The argument is an absolute URL string. The string is assumed to be
     // output of KURL::string() called on a valid KURL object, or indiscernible
     // from such. It is usually best to avoid repeatedly parsing a string,