Pass implementation object to supplemental classes by reference

Source/core/frame/NavigatorID.cpp

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  * Copyright (C) 2013 Samsung Electronics. 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.
@@ skipping 27 matching lines @@
 #include "wtf/StdLibExtras.h"
 #include <sys/utsname.h>
 #endif
 
 #ifndef WEBCORE_NAVIGATOR_PRODUCT
 #define WEBCORE_NAVIGATOR_PRODUCT "Gecko"
 #endif // ifndef WEBCORE_NAVIGATOR_PRODUCT
 
 namespace WebCore {
 
-String NavigatorID::appName(const NavigatorBase*)
+String NavigatorID::appName(const NavigatorBase&)
 {
     return "Netscape";
 }
 
-String NavigatorID::appVersion(const NavigatorBase* navigator)
+String NavigatorID::appVersion(const NavigatorBase& navigator)
 {
     // Version is everything in the user agent string past the "Mozilla/" prefix.
-    const String& agent = navigator->userAgent();
+    const String& agent = navigator.userAgent();
     return agent.substring(agent.find('/') + 1);
 }
 
-String NavigatorID::userAgent(const NavigatorBase* navigator)
+String NavigatorID::userAgent(const NavigatorBase& navigator)
 {
-    return navigator->userAgent();
+    return navigator.userAgent();
 }
 
-String NavigatorID::platform(const NavigatorBase*)
+String NavigatorID::platform(const NavigatorBase&)
 {
 #if defined(WEBCORE_NAVIGATOR_PLATFORM)
     return WEBCORE_NAVIGATOR_PLATFORM;
 #elif OS(MACOSX)
     // Match Safari and Mozilla on Mac x86.
     return "MacIntel";
 #elif OS(WIN)
     // Match Safari and Mozilla on Windows.
     return "Win32";
 #else // Unix-like systems
     struct utsname osname;
     DEFINE_STATIC_LOCAL(String, platformName, (uname(&osname) >= 0 ? String(osname.sysname) + String(" ") + String(osname.machine) : emptyString()));
     return platformName;
 #endif
 }
 
-String NavigatorID::appCodeName(const NavigatorBase*)
+String NavigatorID::appCodeName(const NavigatorBase&)
 {
     return "Mozilla";
 }
 
-String NavigatorID::product(const NavigatorBase*)
+String NavigatorID::product(const NavigatorBase&)
 {
     return WEBCORE_NAVIGATOR_PRODUCT;
 }
 
 } // namespace WebCore