Shutdown StoragePartition before ProfileIOData is being shut down

content/public/browser/browser_context.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 151 matching lines @@
   static BrowserContext* GetBrowserContextForShellUserId(
       const std::string& user_id);
 
   // Returns a Connector associated with this BrowserContext, which can be used
   // to connect to service instances bound as this user.
   static shell::Connector* GetShellConnectorFor(
       BrowserContext* browser_context);
 
   ~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(
       const base::FilePath& partition_path) = 0;
 
   // Returns the path of the directory where this context's data is stored.
   virtual base::FilePath GetPath() const = 0;
 
   // Return whether this context is incognito. Default is false.
   virtual bool IsOffTheRecord() const = 0;
@@ skipping 50 matching lines @@
   // called only once per partition_path.
   virtual net::URLRequestContextGetter*
       CreateMediaRequestContextForStoragePartition(
           const base::FilePath& partition_path,
           bool in_memory) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_CONTEXT_H_