jni: Pass method parameters as JavaParamRef in chrome/browser/ui.

chrome/browser/ui/android/infobars/auto_signin_first_run_infobar.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_ANDROID_INFOBARS_AUTO_SIGNIN_FIRST_RUN_INFOBAR_H_
 #define CHROME_BROWSER_UI_ANDROID_INFOBARS_AUTO_SIGNIN_FIRST_RUN_INFOBAR_H_
 
 #include "base/macros.h"
 #include "chrome/browser/password_manager/auto_signin_first_run_infobar_delegate.h"
 #include "chrome/browser/ui/android/infobars/confirm_infobar.h"
 
 // The Android infobar that offers the user the ability to save a password
 // for the site.
 class AutoSigninFirstRunInfoBar : public ConfirmInfoBar {
  public:
   explicit AutoSigninFirstRunInfoBar(
       scoped_ptr<AutoSigninFirstRunInfoBarDelegate> delegate);
 
   ~AutoSigninFirstRunInfoBar() override;
 
   static bool Register(JNIEnv* env);
 
  private:
   // ConfirmInfoBar:
   base::android::ScopedJavaLocalRef<jobject> CreateRenderInfoBar(
       JNIEnv* env) override;
-  void OnLinkClicked(JNIEnv* env, jobject obj) override;
+  void OnLinkClicked(JNIEnv* env,
+                     const base::android::JavaParamRef<jobject>& obj) override;
 
   DISALLOW_COPY_AND_ASSIGN(AutoSigninFirstRunInfoBar);
 };
 
 #endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_AUTO_SIGNIN_FIRST_RUN_INFOBAR_H_