Move DownloadControllerAndroid from content/ to chrome/

content/browser/android/deferred_download_observer.cc

-// Copyright 2015 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 "content/browser/android/deferred_download_observer.h"
-
-#include <memory>
-
-#include "content/browser/android/download_controller_android_impl.h"
-#include "content/public/browser/web_contents.h"
-
-namespace content {
-
-DeferredDownloadObserver::DeferredDownloadObserver(
-    WebContents* web_contents,
-    const base::Closure& deferred_download_cb)
-    : WebContentsObserver(web_contents),
-      deferred_download_cb_(deferred_download_cb) {
-}
-
-DeferredDownloadObserver::~DeferredDownloadObserver() {}
-
-void DeferredDownloadObserver::WasShown() {
-  deferred_download_cb_.Run();
-  DownloadControllerAndroidImpl::GetInstance()->CancelDeferredDownload(this);
-}
-
-void DeferredDownloadObserver::WebContentsDestroyed() {
-  DownloadControllerAndroidImpl::GetInstance()->CancelDeferredDownload(this);
-}
-
-}  // namespace content