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 c09ae09a4f2a40de11afeeb11014ddae9cdefba8..5881936310d62131e193c58412ecda1c162522f5 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBDatabase.cpp
@@ -364,6 +364,9 @@ void IDBDatabase::closeConnection()
         m_backend.reset();
     }
 
+    if (m_databaseCallbacks)
+        m_databaseCallbacks->detachWebCallbacks();
+
     if (m_contextStopped || !getExecutionContext())
         return;
 
@@ -462,6 +465,9 @@ void IDBDatabase::stop()
         m_backend->close();
         m_backend.reset();
     }
+
+    if (m_databaseCallbacks)
+        m_databaseCallbacks->detachWebCallbacks();
 }
 
 const AtomicString& IDBDatabase::interfaceName() const