Move DownloadControllerAndroid from content/ to chrome/

content/browser/android/deferred_download_observer.h

-// 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.
-
-#ifndef CONTENT_BROWSER_ANDROID_DEFERRED_DOWNLOAD_OBSERVER_H_
-#define CONTENT_BROWSER_ANDROID_DEFERRED_DOWNLOAD_OBSERVER_H_
-
-#include "base/callback.h"
-#include "base/containers/scoped_ptr_hash_map.h"
-#include "base/macros.h"
-#include "content/public/browser/web_contents_observer.h"
-
-namespace content {
-class WebContents;
-
-// Class for handling deferred downloads inside a WebContents. In document
-// mode, it is possible that a download starts before ContentViewCore gets
-// created. This class listens to the WebContentsObserver::WasShown() method
-// before running the download tasks to make sure ContentViewCore is attached
-// to WebContents.
-// TODO(qinmin): Remove this when java Tab object creation is no longer pending
-// on Activity creation.
-class DeferredDownloadObserver : public WebContentsObserver {
- public:
-  DeferredDownloadObserver(WebContents* web_contents,
-                           const base::Closure& deferred_download_cb);
-  ~DeferredDownloadObserver() override;
-
-  // WebContentsObserver method.
-  void WasShown() override;
-  void WebContentsDestroyed() override;
-
- private:
-  // Callback to run when WebContents gets shown.
-  base::Closure deferred_download_cb_;
-
-  DISALLOW_COPY_AND_ASSIGN(DeferredDownloadObserver);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_ANDROID_DEFERRED_DOWNLOAD_OBSERVER_H_