Add missing using statements for JNI types.

blimp/client/core/contents/android/blimp_contents_factory.cc

 // Copyright 2016 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 "blimp/client/core/contents/android/blimp_contents_factory.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "blimp/client/core/contents/android/blimp_contents_impl_android.h"
 #include "blimp/client/core/contents/blimp_contents_impl.h"
 #include "jni/BlimpContentsFactory_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace blimp {
 namespace client {
 
 static base::android::ScopedJavaLocalRef<jobject> CreateBlimpContents(
     JNIEnv* env,
     const JavaParamRef<jclass>& clazz) {
   // To delete |blimp_contents_impl|, the Java caller must call the
   // destroy() method on BlimpContents.
   BlimpContentsImpl* blimp_contents_impl = new BlimpContentsImpl;
   return blimp_contents_impl->GetJavaBlimpContentsImpl();
 }
 
 bool RegisterBlimpContentsFactoryJni(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace client
 }  // namespace blimp