Android WebView: clean up the AwContentsClientBridge webcontents userdata.

android_webview/native/aw_contents_client_bridge.cc

 // Copyright (c) 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_contents_client_bridge.h"
 
 #include "android_webview/common/devtools_instrumentation.h"
 #include "android_webview/native/aw_contents.h"
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
@@ skipping 244 matching lines @@
 void AwContentsClientBridge::RunJavaScriptDialog(
     content::JavaScriptMessageType message_type,
     const GURL& origin_url,
     const base::string16& message_text,
     const base::string16& default_prompt_text,
     const content::JavaScriptDialogManager::DialogClosedCallback& callback) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   JNIEnv* env = AttachCurrentThread();
 
   ScopedJavaLocalRef<jobject> obj = java_ref_.get(env);
-  if (obj.is_null())
+  if (obj.is_null()) {
+    callback.Run(false, base::string16());
     return;
+  }
 
   int callback_id = pending_js_dialog_callbacks_.Add(
       new content::JavaScriptDialogManager::DialogClosedCallback(callback));
   ScopedJavaLocalRef<jstring> jurl(
       ConvertUTF8ToJavaString(env, origin_url.spec()));
   ScopedJavaLocalRef<jstring> jmessage(
       ConvertUTF16ToJavaString(env, message_text));
 
   switch (message_type) {
     case content::JAVASCRIPT_MESSAGE_TYPE_ALERT: {
@@ skipping 100 matching lines @@
       pending_client_cert_request_callbacks_.Lookup(request_id);
   callback->Run(scoped_refptr<net::X509Certificate>());
   pending_client_cert_request_callbacks_.Remove(request_id);
 }
 
 bool RegisterAwContentsClientBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview