Port messages sent by WebIDBFactoryImpl to Mojo.

third_party/WebKit/Source/modules/indexeddb/WebIDBDatabaseCallbacksImpl.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 23 matching lines @@
 // static
 std::unique_ptr<WebIDBDatabaseCallbacksImpl>
 WebIDBDatabaseCallbacksImpl::create(IDBDatabaseCallbacks* callbacks) {
   return wrapUnique(new WebIDBDatabaseCallbacksImpl(callbacks));
 }
 
 WebIDBDatabaseCallbacksImpl::WebIDBDatabaseCallbacksImpl(
     IDBDatabaseCallbacks* callbacks)
     : m_callbacks(callbacks) {}
 
-WebIDBDatabaseCallbacksImpl::~WebIDBDatabaseCallbacksImpl() {}
+WebIDBDatabaseCallbacksImpl::~WebIDBDatabaseCallbacksImpl() {
+  if (m_callbacks)
+    m_callbacks->webCallbacksDestroyed();
+}
 
 void WebIDBDatabaseCallbacksImpl::onForcedClose() {
-  m_callbacks->onForcedClose();
+  if (m_callbacks)
+    m_callbacks->onForcedClose();
 }
 
 void WebIDBDatabaseCallbacksImpl::onVersionChange(long long oldVersion,
                                                   long long newVersion) {
-  m_callbacks->onVersionChange(oldVersion, newVersion);
+  if (m_callbacks)
+    m_callbacks->onVersionChange(oldVersion, newVersion);
 }
 
 void WebIDBDatabaseCallbacksImpl::onAbort(long long transactionId,
                                           const WebIDBDatabaseError& error) {
-  m_callbacks->onAbort(transactionId,
-                       DOMException::create(error.code(), error.message()));
+  if (m_callbacks) {
+    m_callbacks->onAbort(transactionId,
+                         DOMException::create(error.code(), error.message()));
+  }
 }
 
 void WebIDBDatabaseCallbacksImpl::onComplete(long long transactionId) {
-  m_callbacks->onComplete(transactionId);
+  if (m_callbacks)
+    m_callbacks->onComplete(transactionId);
+}
+
+void WebIDBDatabaseCallbacksImpl::detach() {
+  m_callbacks.clear();
 }
 
 }  // namespace blink