[Offline pages] Completely remove offliner factory.

chrome/browser/android/offline_pages/prerendering_offliner_factory.h

-// Copyright 2016 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_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_
-#define CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_
-
-#include "base/macros.h"
-#include "components/offline_pages/core/background/offliner_factory.h"
-
-namespace content {
-class BrowserContext;
-}  // namespace content
-
-namespace offline_pages {
-
-class OfflinerPolicy;
-class Offliner;
-class PrerenderingOffliner;
-
-// A factory to create one unique PrerenderingOffliner.  Since the
-// PrerenderingOffliner is somewhat heavyweight and can use lots of memory, we
-// normally don't want more than one, and we can reuse the offliner for many
-// offlining sessions.
-class PrerenderingOfflinerFactory : public OfflinerFactory {
- public:
-  explicit PrerenderingOfflinerFactory(content::BrowserContext* context);
-  ~PrerenderingOfflinerFactory() override;
-
-  Offliner* GetOffliner(const OfflinerPolicy* policy) override;
-
- private:
-  // The offliner is owned by the factory, since it may be resued.
-  PrerenderingOffliner* offliner_;
-
-  // This is an unowned pointer, expected to stay valid for the lifetime of the
-  // factory.
-  content::BrowserContext* context_;
-
-  DISALLOW_COPY_AND_ASSIGN(PrerenderingOfflinerFactory);
-};
-
-}  // namespace offline_pages
-
-#endif  // CHROME_BROWSER_ANDROID_OFFLINE_PAGES_PRERENDERING_OFFLINER_FACTORY_H_