Add missing using statements for JNI types.

chrome/browser/android/document/document_web_contents_delegate.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 "chrome/browser/android/document/document_web_contents_delegate.h"
 
 #include "components/web_contents_delegate_android/web_contents_delegate_android.h"
 #include "content/public/browser/web_contents.h"
 #include "jni/DocumentWebContentsDelegate_jni.h"
 
+using base::android::JavaParamRef;
+
 DocumentWebContentsDelegate::DocumentWebContentsDelegate(JNIEnv* env,
                                                          jobject obj)
     : WebContentsDelegateAndroid(env, obj) {
 }
 
 DocumentWebContentsDelegate::~DocumentWebContentsDelegate() {
 }
 
 void DocumentWebContentsDelegate::AttachContents(
     JNIEnv* env,
@@ skipping 32 matching lines @@
     const GURL& target_url,
     const std::string& partition_id,
     content::SessionStorageNamespace* session_storage_namespace) {
   NOTREACHED();
   return false;
 }
 
 static jlong Initialize(JNIEnv* env, const JavaParamRef<jobject>& obj) {
   return reinterpret_cast<intptr_t>(new DocumentWebContentsDelegate(env, obj));
 }