[fsp] Unmount file systems when the providing extension gets unloaded.

chrome/browser/chromeos/file_system_provider/service.h

 // Copyright 2014 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 CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 #define CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
 #include "chrome/browser/chromeos/file_system_provider/request_manager.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/file_system_provider.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/browser_context.h"
+#include "extensions/browser/extension_registry_observer.h"
+
+namespace extensions {
+class Extension;
+class ExtensionRegistry;
+}  // namespace extensions
 
 namespace chromeos {
 namespace file_system_provider {
 
 class ProvidedFileSystemInfo;
 class ProvidedFileSystemInterface;
 class ServiceFactory;
 
 // Manages and registers the fileSystemProvider service.
-class Service : public KeyedService {
+class Service : public KeyedService,
+                public extensions::ExtensionRegistryObserver {
  public:
-  explicit Service(Profile* profile);
+  explicit Service(Profile* profile,
+                   extensions::ExtensionRegistry* extension_registry);
   virtual ~Service();
 
   // Mounts a file system provided by an extension with the |extension_id|.
   // For success, it returns a numeric file system id, which is an
   // auto-incremented non-zero value. For failures, it returns zero.
   int MountFileSystem(const std::string& extension_id,
                       const std::string& file_system_name);
 
   // Unmounts a file system with the specified |file_system_id| for the
   // |extension_id|. For success returns true, otherwise false.
@@ skipping 17 matching lines @@
   // Adds and removes observers.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // Gets the singleton instance for the |context|.
   static Service* Get(content::BrowserContext* context);
 
   // BrowserContextKeyedService overrides.
   virtual void Shutdown() OVERRIDE;
 
+  // extensions::ExtensionRegistryObserver overrides.
+  virtual void OnExtensionUnloaded(const extensions::Extension* extension)
+      OVERRIDE;
+
   // Getter for the request manager. Used by the extension API to forward
   // replies. Valid as long as the service.
   RequestManager* request_manager() { return &request_manager_; }
 
  private:
   typedef std::map<int, ProvidedFileSystemInterface*> ProvidedFileSystemMap;
 
   // Called when the providing extension accepts or refuses a unmount request.
   // If |error| is equal to FILE_OK, then the request is accepted.
   void OnRequestUnmountStatus(const ProvidedFileSystemInfo& file_system_info,
                               base::File::Error error);
 
+  Profile* profile_;
+
+  // Owned by extensions::ExtensionRegistryFactory.
+  extensions::ExtensionRegistry* extension_registry_;
+
   RequestManager request_manager_;
-  Profile* profile_;
   ObserverList<Observer> observers_;
   ProvidedFileSystemMap file_system_map_;  // Owns pointers.
 
   int next_id_;
   base::WeakPtrFactory<Service> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Service);
 };
 
 }  // namespace file_system_provider
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FILE_SYSTEM_PROVIDER_SERVICE_H_