Shutdown StoragePartition before ProfileIOData is being shut down

content/public/browser/browser_context.h

Index: content/public/browser/browser_context.h
diff --git a/content/public/browser/browser_context.h b/content/public/browser/browser_context.h
index 05f80861400fb6f69bc88d6b2b777395b3c87341..4d96452e814698549b7fc86f41973c3c195677a9 100644
--- a/content/public/browser/browser_context.h
+++ b/content/public/browser/browser_context.h
@@ -169,6 +169,13 @@ class CONTENT_EXPORT BrowserContext : public base::SupportsUserData {
 
   ~BrowserContext() override;
 
+  // Shuts down the storage partitions associated to this browser context.
+  // This must be called before the browser context is actually destroyed
+  // and before a clean-up task for its corresponding IO thread residents (e.g.
+  // ResourceContext) is posted, so that the classes that hung on
+  // StoragePartition can have time to do necessary cleanups on IO thread.
+  void ShutdownStoragePartitions();
+
   // Creates a delegate to initialize a HostZoomMap and persist its information.
   // This is called during creation of each StoragePartition.
   virtual std::unique_ptr<ZoomLevelDelegate> CreateZoomLevelDelegate(