Add missing using statements for JNI types.

android_webview/native/aw_pdf_exporter.cc

 // Copyright 2013 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 "android_webview/native/aw_pdf_exporter.h"
 
 #include "android_webview/browser/aw_print_manager.h"
 #include "base/android/jni_android.h"
 #include "content/public/browser/browser_thread.h"
 #include "jni/AwPdfExporter_jni.h"
 #include "printing/print_settings.h"
 #include "printing/units.h"
 
+using base::android::JavaParamRef;
+using base::android::ScopedJavaLocalRef;
+
 namespace android_webview {
 
 AwPdfExporter::AwPdfExporter(JNIEnv* env,
                              jobject obj,
                              content::WebContents* web_contents)
     : java_ref_(env, obj),
       web_contents_(web_contents) {
   DCHECK(obj);
   Java_AwPdfExporter_setNativeAwPdfExporter(
       env, obj, reinterpret_cast<intptr_t>(this));
@@ skipping 72 matching lines @@
   if (obj.is_null())
     return;
   Java_AwPdfExporter_didExportPdf(env, obj.obj(), success);
 }
 
 bool RegisterAwPdfExporter(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview