[Offline pages] Completely remove offliner factory.

chrome/browser/android/offline_pages/prerendering_offliner_factory.cc

-// 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.
-
-#include "chrome/browser/android/offline_pages/prerendering_offliner_factory.h"
-
-#include "chrome/browser/android/offline_pages/offline_page_model_factory.h"
-#include "chrome/browser/android/offline_pages/prerendering_offliner.h"
-
-namespace offline_pages {
-
-class OfflinerPolicy;
-
-PrerenderingOfflinerFactory::PrerenderingOfflinerFactory(
-    content::BrowserContext* context) {
-  offliner_ = nullptr;
-  context_ = context;
-}
-
-PrerenderingOfflinerFactory::~PrerenderingOfflinerFactory() {
-  delete offliner_;
-}
-
-// static
-Offliner* PrerenderingOfflinerFactory::GetOffliner(
-    const OfflinerPolicy* policy) {
-  // TODO(petewil): Think about whether there might be any threading
-  // issues.  This should always happen on the same thread, but make sure.
-
-  // Build a prerendering offliner if we don't already have one cached.
-  if (offliner_ == nullptr) {
-    // TODO(petewil): Create a PrerenderManager, use for 2nd arg below.
-
-    // Get a pointer to the (unowned) offline page model.
-    OfflinePageModel* model =
-        OfflinePageModelFactory::GetInstance()->GetForBrowserContext(context_);
-    // Ensure we do have a model for saving a page if we prerender it.
-    DCHECK(model) << "No OfflinePageModel for offliner";
-    offliner_ = new PrerenderingOffliner(context_, policy, model);
-  }
-
-  return offliner_;
-}
-
-}  // namespace offline_pages