chrome/browser: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

chrome/browser/download/download_shelf.cc

 // Copyright (c) 2012 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.
 
 #define _USE_MATH_DEFINES  // For VC++ to get M_PI. This has to be first.
 
 #include "chrome/browser/download/download_shelf.h"
 
 #include <cmath>
 
 #include "base/bind.h"
 #include "base/callback.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/thread_task_runner_handle.h"
 #include "chrome/browser/download/download_item_model.h"
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/download/download_service_factory.h"
 #include "chrome/browser/download/download_started_animation.h"
 #include "chrome/browser/platform_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/grit/locale_settings.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 149 matching lines @@
   PaintDownloadComplete(canvas, rtl_mirror, origin_x, origin_y,
                         1.0 - animation_progress);
 }
 
 void DownloadShelf::AddDownload(DownloadItem* download) {
   DCHECK(download);
   if (DownloadItemModel(download).ShouldRemoveFromShelfWhenComplete()) {
     // If we are going to remove the download from the shelf upon completion,
     // wait a few seconds to see if it completes quickly. If it's a small
     // download, then the user won't have time to interact with it.
-    base::MessageLoop::current()->PostDelayedTask(
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&DownloadShelf::ShowDownloadById,
-                   weak_ptr_factory_.GetWeakPtr(),
-                   download->GetId()),
+                   weak_ptr_factory_.GetWeakPtr(), download->GetId()),
         GetTransientDownloadShowDelay());
   } else {
     ShowDownload(download);
   }
 }
 
 void DownloadShelf::Show() {
   if (is_hidden_) {
     should_show_on_unhide_ = true;
     return;
@@ skipping 74 matching lines @@
   content::DownloadManager* download_manager = GetDownloadManager();
   if (!download_manager)
     return;
 
   DownloadItem* download = download_manager->GetDownload(download_id);
   if (!download)
     return;
 
   ShowDownload(download);
 }