[IndexedDB] Fixed possible refcount race

content/browser/indexed_db/indexed_db_context_impl.cc

Index: content/browser/indexed_db/indexed_db_context_impl.cc
diff --git a/content/browser/indexed_db/indexed_db_context_impl.cc b/content/browser/indexed_db/indexed_db_context_impl.cc
index c79635f991e78ea24068f999cbe84b956a328bc8..ec8a2c8fb37568edbd73a453ffec3e14a3b81526 100644
--- a/content/browser/indexed_db/indexed_db_context_impl.cc
+++ b/content/browser/indexed_db/indexed_db_context_impl.cc
@@ -467,9 +467,9 @@ void IndexedDBContextImpl::DatabaseDeleted(const Origin& origin) {
 
 IndexedDBContextImpl::~IndexedDBContextImpl() {
   if (factory_.get()) {
-    TaskRunner()->PostTask(
-        FROM_HERE, base::Bind(&IndexedDBFactory::ContextDestroyed, factory_));
-    factory_ = NULL;

[pwnall, 2017/05/19 00:16:32]

why not nullptr?

+    TaskRunner()->PostTask(FROM_HERE,
+                           base::Bind(&IndexedDBFactory::ContextDestroyed,
+                                      base::Passed(&factory_)));
   }
 
   if (data_path_.empty())