Create CoreTabHelper, move remaining core TCW functionality into it.

chrome/browser/safe_browsing/safe_browsing_tab_observer.h

+// 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 CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_TAB_OBSERVER_H_
+#define CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_TAB_OBSERVER_H_
+#pragma once
+
+#include "base/memory/scoped_ptr.h"
+#include "chrome/browser/prefs/pref_change_registrar.h"
+#include "content/public/browser/notification_observer.h"
+
+class TabContentsWrapper;
+
+namespace safe_browsing {
+
+class ClientSideDetectionHost;
+
+// Per-tab class to handle safe-browsing functionality.
+class SafeBrowsingTabObserver : public content::NotificationObserver {
+ public:
+  explicit SafeBrowsingTabObserver(TabContentsWrapper* wrapper);
+  virtual ~SafeBrowsingTabObserver();
+
+ private:
+  // content::NotificationObserver overrides:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Internal helpers ----------------------------------------------------------
+
+  // Create or destroy SafebrowsingDetectionHost as needed if the user's
+  // safe browsing preference has changed.
+  void UpdateSafebrowsingDetectionHost();
+
+  // Handles IPCs.
+  scoped_ptr<ClientSideDetectionHost> safebrowsing_detection_host_;
+
+  // Our owning TabContentsWrapper.
+  TabContentsWrapper* wrapper_;
+
+  PrefChangeRegistrar pref_change_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(SafeBrowsingTabObserver);
+};
+
+}  // namespace safe_browsing
+
+#endif  // CHROME_BROWSER_SAFE_BROWSING_SAFE_BROWSING_TAB_OBSERVER_H_