jni_generator: Pass object parameters as JavaParamRef.

mojo/runner/android/bootstrap.cc

 // Copyright 2014 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 "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "jni/Bootstrap_jni.h"
 #include "mojo/runner/android/run_android_application_function.h"
 
 namespace mojo {
 namespace runner {
 
 void Bootstrap(JNIEnv* env,
-               jobject,
-               jobject j_context,
-               jstring j_native_library_path,
+               const JavaParamRef<jobject>&,
+               const JavaParamRef<jobject>& j_context,
+               const JavaParamRef<jstring>& j_native_library_path,
                jint j_handle,
                jlong j_run_application_ptr,
                jboolean is_cached_app) {
   base::FilePath app_path(
       base::android::ConvertJavaStringToUTF8(env, j_native_library_path));
   RunAndroidApplicationFn run_android_application_fn =
       reinterpret_cast<RunAndroidApplicationFn>(j_run_application_ptr);
   run_android_application_fn(env, j_context, app_path, j_handle, is_cached_app);
 }
 
 bool RegisterBootstrapJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace runner
 }  // namespace mojo
 
 JNI_EXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   base::android::InitVM(vm);
   JNIEnv* env = base::android::AttachCurrentThread();
 
   if (!mojo::runner::RegisterBootstrapJni(env))
     return -1;
 
   return JNI_VERSION_1_4;
 }