Add missing using statements for JNI types.

components/dom_distiller/core/distilled_page_prefs_android.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 "components/dom_distiller/core/distilled_page_prefs_android.h"
 
 #include "components/dom_distiller/core/distilled_page_prefs.h"
 #include "components/dom_distiller/core/dom_distiller_service.h"
 #include "jni/DistilledPagePrefs_jni.h"
 
+using base::android::JavaParamRef;
+
 namespace dom_distiller {
 
 namespace android {
 
 DistilledPagePrefsAndroid::DistilledPagePrefsAndroid(
     JNIEnv* env,
     jobject obj,
     DistilledPagePrefs* distilled_page_prefs_ptr)
     : distilled_page_prefs_(distilled_page_prefs_ptr) {
 }
@@ skipping 105 matching lines @@
 
 jlong InitObserverAndroid(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   DistilledPagePrefsObserverAndroid* observer_android =
       new DistilledPagePrefsObserverAndroid(env, obj);
   return reinterpret_cast<intptr_t>(observer_android);
 }
 
 }  // namespace android
 
 }  // namespace dom_distiller