Add missing using statements for JNI types.

components/signin/core/browser/child_account_info_fetcher_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/signin/core/browser/child_account_info_fetcher_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "components/signin/core/browser/account_fetcher_service.h"
 #include "components/signin/core/browser/account_tracker_service.h"
 #include "jni/ChildAccountInfoFetcher_jni.h"
 
+using base::android::JavaParamRef;
+
 // static
 void ChildAccountInfoFetcherAndroid::StartFetchingChildAccountInfo(
     AccountFetcherService* service,
     const std::string& account_id) {
   JNIEnv* env = base::android::AttachCurrentThread();
   std::string account_name =
       service->account_tracker_service()->GetAccountInfo(account_id).email;
   // The AccountTrackerService may not be populated correctly in tests.
   if (account_name.empty())
     return;
@@ skipping 12 matching lines @@
                        const JavaParamRef<jclass>& caller,
                        jlong native_service,
                        const JavaParamRef<jstring>& j_account_id,
                        jboolean is_child_account) {
   AccountFetcherService* service =
       reinterpret_cast<AccountFetcherService*>(native_service);
   service->SetIsChildAccount(
       base::android::ConvertJavaStringToUTF8(env, j_account_id),
       is_child_account);
 }