Add missing using statements for JNI types.

content/shell/android/linker_test_apk/chromium_linker_test_linker_tests.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.
 
 // This file implements the native methods of
 // org.content.chromium.app.LinkerTests
 // Unlike the content of linker_jni.cc, it is part of the content library and
 // can thus use base/ and the C++ STL.
 
 #include "content/shell/android/linker_test_apk/chromium_linker_test_linker_tests.h"
 
 #include <errno.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <sys/mman.h>
 #include <string>
 #include <vector>
 
 #include "base/debug/proc_maps_linux.h"
 #include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "jni/LinkerTests_jni.h"
 #include "third_party/re2/src/re2/re2.h"
 
+using base::android::JavaParamRef;
+
 namespace content {
 
 namespace {
 
 using base::debug::MappedMemoryRegion;
 
 jboolean RunChecks(bool in_browser_process, bool need_relros) {
   // IMPORTANT NOTE: The Python test control script reads the logcat for
   // lines like:
   //   BROWSER_LINKER_TEST: <status>
@@ skipping 168 matching lines @@
 
 jboolean CheckForNoSharedRelros(JNIEnv* env,
                                 const JavaParamRef<jclass>& clazz,
                                 jboolean in_browser_process) {
   return RunChecks(in_browser_process, false);
 }
 
 bool RegisterLinkerTestsJni(JNIEnv* env) { return RegisterNativesImpl(env); }
 
 }  // namespace content