jni_generator: Pass object parameters as JavaParamRef.

content/shell/browser/shell_android.cc

 // Copyright 2013 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.
 
 #include "content/shell/browser/shell.h"
 
 #include <jni.h>
 
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 86 matching lines @@
   RemoveShellView(java_object_.obj());
   delete this;
 }
 
 // static
 bool Shell::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 // static
-void CloseShell(JNIEnv* env, jclass clazz, jlong shellPtr) {
+void CloseShell(JNIEnv* env,
+                const JavaParamRef<jclass>& clazz,
+                jlong shellPtr) {
   Shell* shell = reinterpret_cast<Shell*>(shellPtr);
   shell->Close();
 }
 
 }  // namespace content