Add missing using statements for JNI types.

components/safe_json/json_sanitizer_android.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 "components/safe_json/json_sanitizer.h"
 
 #include "base/android/jni_string.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string_util.h"
 #include "base/threading/sequenced_task_runner_handle.h"
 #include "jni/JsonSanitizer_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace safe_json {
 
 namespace {
 
 // An implementation of JsonSanitizer that calls into Java. It deals with
 // malformed input (in particular malformed Unicode encodings) in the following
 // steps:
 // 1. The input string is checked for whether it is well-formed UTF-8. Malformed
 //    UTF-8 is rejected.
 // 2. The UTF-8 string is converted in native code to a Java String, which is
@@ skipping 87 matching lines @@
   JsonSanitizerAndroid sanitizer(success_callback, error_callback);
   sanitizer.Sanitize(unsafe_json);
 }
 
 // static
 bool JsonSanitizer::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace safe_json