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 e1e3b2cdc192ecbc70c50c2d1d32e989d53a8a58..edad66364e41f4c775f12b3ac31553c1890bdf9a 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -60,7 +60,6 @@
 #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"
@@ -719,8 +718,6 @@ 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());