Add missing using statements for JNI types.

mojo/android/system/core_impl.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 "mojo/android/system/core_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/android/base_jni_registrar.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_registrar.h"
 #include "base/android/library_loader/library_loader_hooks.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "jni/CoreImpl_jni.h"
 #include "mojo/message_pump/handle_watcher.h"
 #include "mojo/public/c/system/core.h"
 
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
+
 namespace {
 
 using MojoAsyncWaitID = uintptr_t;
 const MojoAsyncWaitID kInvalidHandleCancelID = 0;
 
 struct AsyncWaitCallbackData {
   base::android::ScopedJavaGlobalRef<jobject> core_impl;
   base::android::ScopedJavaGlobalRef<jobject> callback;
   base::android::ScopedJavaGlobalRef<jobject> cancellable;
 
@@ skipping 386 matching lines @@
     return 0;
   return alignment - offset;
 }
 
 bool RegisterCoreImpl(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace mojo