Bug 1247160 - Clipboard causes memory leak by internet shortcut. r=jimm

UTF8ToNewUnicode alloces new memory, so we don't need new alloc to convert to UTF-16

MozReview-Commit-ID: K7saM1xxNQ1

--HG--
extra : rebase_source : 06921086d842f7f6cdbe40d5d78fd024c310811d

widget/windows/nsClipboard.cpp

@@ -836,7 +836,7 @@ nsClipboard :: FindURLFromLocalFile ( IDataObject* inDataObject, UINT inIndex, v
       ResolveShortcut( file, url );
       if ( !url.IsEmpty() ) {
         // convert it to unicode and pass it out
-        nsDependentString urlString(UTF8ToNewUnicode(url));
+        NS_ConvertUTF8toUTF16 urlString(url);
         // the internal mozilla URL format, text/x-moz-url, contains
         // URL\ntitle.  We can guess the title from the file's name.
         nsAutoString title;