jni_generator: Pass object parameters as JavaParamRef.

android_webview/native/aw_message_port_service_impl.cc

Index: android_webview/native/aw_message_port_service_impl.cc
diff --git a/android_webview/native/aw_message_port_service_impl.cc b/android_webview/native/aw_message_port_service_impl.cc
index 969842dc232a8a3bc63ab2411a44293aae23eca9..cbbe282973af48b0db7fd0b815a8663feeec2679 100644
--- a/android_webview/native/aw_message_port_service_impl.cc
+++ b/android_webview/native/aw_message_port_service_impl.cc
@@ -231,7 +231,7 @@ bool RegisterAwMessagePortService(JNIEnv* env) {
 }
 
 // static
-jlong InitAwMessagePortService(JNIEnv* env, jobject obj) {
+jlong InitAwMessagePortService(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   AwMessagePortServiceImpl* service = AwMessagePortServiceImpl::GetInstance();
   service->Init(env, obj);
   return reinterpret_cast<intptr_t>(service);