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diff --git a/content/browser/appcache/chrome_appcache_service.h b/content/browser/appcache/chrome_appcache_service.h
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+++ b/content/browser/appcache/chrome_appcache_service.h
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+// Copyright (c) 2011 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_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
+#define CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
+#pragma once
+
+#include "base/ref_counted.h"
+#include "chrome/browser/content_settings/host_content_settings_map.h"
+#include "chrome/common/notification_registrar.h"
+#include "content/browser/browser_thread.h"
+#include "webkit/appcache/appcache_policy.h"
+#include "webkit/appcache/appcache_service.h"
+
+class ChromeURLRequestContext;
+class FilePath;
+
+// An AppCacheService subclass used by the chrome. There is an instance
+// associated with each Profile. This derivation adds refcounting semantics
+// since a profile has multiple URLRequestContexts which refer to the same
+// object, and those URLRequestContexts are refcounted independently of the
+// owning profile.
+//
+// All methods, except the ctor, are expected to be called on
+// the IO thread (unless specifically called out in doc comments).
+class ChromeAppCacheService
+    : public base::RefCountedThreadSafe<ChromeAppCacheService,
+                                        BrowserThread::DeleteOnIOThread>,
+      public appcache::AppCacheService,
+      public appcache::AppCachePolicy,
+      public NotificationObserver {
+ public:
+  ChromeAppCacheService();
+
+  void InitializeOnIOThread(
+      const FilePath& profile_path, bool is_incognito,
+      scoped_refptr<HostContentSettingsMap> content_settings_map,
+      bool clear_local_state_on_exit);
+
+  // Helpers used by the extension service to grant and revoke
+  // unlimited storage to app extensions.
+  void SetOriginQuotaInMemory(const GURL& origin, int64 quota);
+  void ResetOriginQuotaInMemory(const GURL& origin);
+
+  void SetClearLocalStateOnExit(bool clear_local_state);
+
+ private:
+  friend class BrowserThread;
+  friend class DeleteTask<ChromeAppCacheService>;
+
+  virtual ~ChromeAppCacheService();
+
+  // AppCachePolicy overrides
+  virtual bool CanLoadAppCache(const GURL& manifest_url);
+  virtual int CanCreateAppCache(const GURL& manifest_url,
+                                net::CompletionCallback* callback);
+
+  // NotificationObserver override
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
+  scoped_refptr<HostContentSettingsMap> host_contents_settings_map_;
+  NotificationRegistrar registrar_;
+  bool clear_local_state_on_exit_;
+  FilePath cache_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeAppCacheService);
+};
+
+#endif  // CONTENT_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_