jni_generator: Pass object parameters as JavaParamRef.

components/cronet/android/test/test_upload_data_stream_handler.cc

 // 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.
 
 #include "test_upload_data_stream_handler.h"
 
 #include <string>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 151 matching lines @@
   std::string data_read = "";
   if (read_buffer_.get() && bytes_read_ > 0)
     data_read = std::string(read_buffer_->data(), bytes_read_);
   cronet::Java_TestUploadDataStreamHandler_onReadCompleted(
       env, jtest_upload_data_stream_handler_.obj(), bytes_read_,
       base::android::ConvertUTF8ToJavaString(env, data_read).obj());
 }
 
 static jlong CreateTestUploadDataStreamHandler(
     JNIEnv* env,
-    jobject jtest_upload_data_stream_handler,
+    const JavaParamRef<jobject>& jtest_upload_data_stream_handler,
     jlong jupload_data_stream) {
   scoped_ptr<net::UploadDataStream> upload_data_stream(
       reinterpret_cast<net::UploadDataStream*>(jupload_data_stream));
   TestUploadDataStreamHandler* handler = new TestUploadDataStreamHandler(
       upload_data_stream.Pass(), env, jtest_upload_data_stream_handler);
   return reinterpret_cast<jlong>(handler);
 }
 
 bool TestUploadDataStreamHandlerRegisterJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace cronet