Delete session area when session storage for an origin is deleted.

content/browser/dom_storage/dom_storage_context_impl.cc

Index: content/browser/dom_storage/dom_storage_context_impl.cc
diff --git a/content/browser/dom_storage/dom_storage_context_impl.cc b/content/browser/dom_storage/dom_storage_context_impl.cc
index 2b945dea40fc23536b5d7a92c92dc133fcad4fa0..69a6a999ee3005dd60d4609a08c34693fa1919f4 100644
--- a/content/browser/dom_storage/dom_storage_context_impl.cc
+++ b/content/browser/dom_storage/dom_storage_context_impl.cc
@@ -256,6 +256,13 @@ void DOMStorageContextImpl::DeleteSessionStorage(
     dom_storage_namespace = GetStorageNamespace(namespace_id);
   }
   dom_storage_namespace->DeleteSessionStorageOrigin(usage_info.origin);
+  if (session_storage_database_.get()) {
+    task_runner_->PostShutdownBlockingTask(
+        FROM_HERE, DOMStorageTaskRunner::COMMIT_SEQUENCE,
+        base::Bind(base::IgnoreResult(&SessionStorageDatabase::DeleteArea),
+                   session_storage_database_,
+                   usage_info.persistent_namespace_id, usage_info.origin));
+  }
   // Synthesize a 'cleared' event if the area is open so CachedAreas in
   // renderers get emptied out too.
   DOMStorageArea* area =