Port messages sent by WebIDBFactoryImpl to Mojo.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
index 27ac511383a68a6b98a538db508c9a15e929c52a..c9dab967b630c120f540dc963b386f845fbad671 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
@@ -413,6 +413,9 @@ void IDBDatabase::closeConnection() {
     m_backend.reset();
   }
 
+  if (m_databaseCallbacks)
+    m_databaseCallbacks->detachWebCallbacks();
+
   if (m_contextStopped || !getExecutionContext())
     return;
 
@@ -515,6 +518,9 @@ void IDBDatabase::stop() {
     m_backend->close();
     m_backend.reset();
   }
+
+  if (m_databaseCallbacks)
+    m_databaseCallbacks->detachWebCallbacks();
 }
 
 const AtomicString& IDBDatabase::interfaceName() const {