Move Indexed DB from dedicated thread to task scheduler

content/browser/indexed_db/indexed_db_backing_store.cc

Index: content/browser/indexed_db/indexed_db_backing_store.cc
diff --git a/content/browser/indexed_db/indexed_db_backing_store.cc b/content/browser/indexed_db/indexed_db_backing_store.cc
index 64d229150e7ce0715018849ad99bee48db13372a..c5ecee8d36f187ca883bfc7178eff212534fc043 100644
--- a/content/browser/indexed_db/indexed_db_backing_store.cc
+++ b/content/browser/indexed_db/indexed_db_backing_store.cc
@@ -2599,8 +2599,8 @@ class LocalWriteClosure : public FileWriterDelegate::DelegateWriteCallback,
  private:
   virtual ~LocalWriteClosure() {
     // Make sure the last reference to a ChainedBlobWriter is released (and
-    // deleted) on the IDB thread since it owns a transaction which has thread
-    // affinity.
+    // deleted) on the IDB sequence since it owns a transaction which has
+    // sequence affinity.
     IndexedDBBackingStore::Transaction::ChainedBlobWriter* raw_tmp =
         chained_blob_writer_.get();
     raw_tmp->AddRef();