Refactor downloads into a ProfileKeyedService.

chrome/browser/download/download_service.cc

+// 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.
+
+#include "chrome/browser/download/download_service.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "chrome/browser/profiles/profile.h"
+#include "content/browser/download/download_manager.h"
+
+DownloadService::DownloadService(Profile* profile)
+    : download_manager_created_(false),
+      profile_(profile) {}
+
+DownloadService::~DownloadService() {}
+
+DownloadManager* DownloadService::GetDownloadManager() {
+  if (!download_manager_created_) {
+    // In case the delegate has already been set by SetDownloadManagerDelegate.
+    if (!manager_delegate_.get())
+      manager_delegate_ = new ChromeDownloadManagerDelegate(profile_);
+    manager_ = new DownloadManager(
+        manager_delegate_.get(), g_browser_process->download_status_updater());
+    manager_->Init(profile_);
+    manager_delegate_->SetDownloadManager(manager_);
+    download_manager_created_ = true;
+  }
+  return manager_.get();
+}
+
+bool DownloadService::HasCreatedDownloadManager() {
+  return download_manager_created_;
+}
+
+void DownloadService::SetDownloadManagerDelegate(
+    ChromeDownloadManagerDelegate* new_delegate) {
+  manager_->set_delegate(new_delegate);
+  new_delegate->SetDownloadManager(manager_);
+  manager_delegate_ = new_delegate;
+}
+
+void DownloadService::Shutdown() {
+  if (manager_.get()) {
+    manager_->Shutdown();
+
+    // The manager reference can be released any time after shutdown;
+    // it will be destroyed when the last reference is released on the
+    // FILE thread.
+    // Resetting here will guarantee that any attempts to get the
+    // DownloadManager after shutdown will return null.
+    //
+    // TODO(rdsmith): Figure out how to guarantee when the last reference
+    // will be released and make DownloadManager not RefCountedThreadSafe<>.
+    manager_.release();
+  }
+  if (manager_delegate_.get())
+    manager_delegate_.release();
+}