Send IndexedDB observations through IDBDatabaseCallbacks.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index b6efb51e44145eee2721f4f872d16fc3a07fbfcc..eea35af04bb527321ee7071ab8f12c6b43a969ac 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -59,7 +59,6 @@
 #include "content/child/content_child_helpers.h"
 #include "content/child/db_message_filter.h"
 #include "content/child/indexed_db/indexed_db_dispatcher.h"
-#include "content/child/indexed_db/indexed_db_message_filter.h"
 #include "content/child/memory/child_memory_coordinator_impl.h"
 #include "content/child/resource_dispatcher.h"
 #include "content/child/resource_scheduling_filter.h"
@@ -720,8 +719,6 @@ void RenderThreadImpl::Init(
   midi_message_filter_ = new MidiMessageFilter(GetIOTaskRunner());
   AddFilter(midi_message_filter_.get());
 
-  AddFilter((new IndexedDBMessageFilter(thread_safe_sender()))->GetFilter());
-
   AddFilter((new CacheStorageMessageFilter(thread_safe_sender()))->GetFilter());
 
   AddFilter((new ServiceWorkerContextMessageFilter())->GetFilter());