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diff --git a/chrome/browser/appcache/chrome_appcache_service.h b/chrome/browser/appcache/chrome_appcache_service.h
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+++ b/chrome/browser/appcache/chrome_appcache_service.h
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+// Copyright (c) 2010 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_APPCACHE_CHROME_APPCACHE_SERVICE_H_
+#define CHROME_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_
+
+#include "base/ref_counted.h"
+#include "chrome/browser/host_content_settings_map.h"
+#include "chrome/common/notification_registrar.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, including the ctor and dtor, are expected to be called on
+// the IO thread.
+class ChromeAppCacheService
+    : public base::RefCounted<ChromeAppCacheService>,
+      public appcache::AppCacheService,
+      public appcache::AppCachePolicy,
+      public NotificationObserver {
+ public:
+  ChromeAppCacheService(const FilePath& profile_path,
+                        ChromeURLRequestContext* request_context);
+
+  static void ClearLocalState(const FilePath& profile_path);
+
+ private:
+  friend class base::RefCounted<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_;
+};
+
+#endif  // CHROME_BROWSER_APPCACHE_CHROME_APPCACHE_SERVICE_H_