RefCounted types should not have public destructors, chromeos edition

chrome/browser/chromeos/mobile/mobile_activator.h

Index: chrome/browser/chromeos/mobile/mobile_activator.h
diff --git a/chrome/browser/chromeos/mobile/mobile_activator.h b/chrome/browser/chromeos/mobile/mobile_activator.h
index cd5bc50a906a95e6a104be3842dd20e793624258..3b7e8810ea756dd5943788bf5c642eb5076323b6 100644
--- a/chrome/browser/chromeos/mobile/mobile_activator.h
+++ b/chrome/browser/chromeos/mobile/mobile_activator.h
@@ -22,7 +22,6 @@ class CellularConfigDocument
     : public base::RefCountedThreadSafe<CellularConfigDocument> {
  public:
   CellularConfigDocument();
-  virtual ~CellularConfigDocument();
 
   // Return error message for a given code.
   std::string GetErrorMessage(const std::string& code);
@@ -30,8 +29,11 @@ class CellularConfigDocument
   const std::string& version() { return version_; }
 
  private:
+  friend class base::RefCountedThreadSafe<CellularConfigDocument>;
   typedef std::map<std::string, std::string> ErrorMap;
 
+  virtual ~CellularConfigDocument();
+
   void SetErrorMap(const ErrorMap& map);
   bool LoadFromFile(const FilePath& config_path);