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 fb1d7dce00a1117b51e0da271513027838cce203..e1be62e735c649701c472356d6cebedadc2d66f6 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
@@ -394,6 +394,9 @@ void IDBDatabase::closeConnection() {
     m_backend.reset();
   }
 
+  if (m_databaseCallbacks)
+    m_databaseCallbacks->detachWebCallbacks();
+
   if (m_contextStopped || !getExecutionContext())
     return;
 
@@ -526,6 +529,9 @@ void IDBDatabase::contextDestroyed() {
     m_backend->close();
     m_backend.reset();
   }
+
+  if (m_databaseCallbacks)
+    m_databaseCallbacks->detachWebCallbacks();
 }
 
 const AtomicString& IDBDatabase::interfaceName() const {