Fixes for turning on offliner request.

chrome/browser/android/offline_pages/prerendering_loader.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_loader.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace offline_pages {
 
 PrerenderingLoader::PrerenderingLoader(content::BrowserContext* browser_context)
     : state_(State::IDLE), browser_context_(browser_context) {
   adapter_.reset(new PrerenderAdapter(this));
 }
 
 PrerenderingLoader::~PrerenderingLoader() {
   CancelPrerender();
 }
 
-bool PrerenderingLoader::LoadPage(const GURL& url,
-                                  const LoadPageCallback& callback) {
+bool PrerenderingLoader::LoadPage(const GURL& url, LoadPageCallback callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   if (!IsIdle()) {
     DVLOG(1)
         << "WARNING: Existing request in progress or waiting for StopLoading()";
     return false;
   }
   if (!CanPrerender())
     return false;
 
   // Create a WebContents instance to define and hold a SessionStorageNamespace
@@ skipping 122 matching lines @@
   session_contents_.reset(nullptr);
   if (!IsLoaded() && !IsIdle()) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::Bind(callback_, Offliner::RequestStatus::CANCELED, nullptr));
   }
   state_ = State::IDLE;
 }
 
 }  // namespace offline_pages