Merge jumplist delete task and update task

chrome/browser/win/jumplist.cc

 // Copyright 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.
 
 #include "chrome/browser/win/jumplist.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 259 matching lines @@
     // Make sure we are not out of date: if icon_urls_ is not empty, then
     // another notification has been received since we processed this one
     if (!data->icon_urls_.empty())
       return;
 
     // Make local copies of lists so we can release the lock.
     local_most_visited_pages = data->most_visited_pages_;
     local_recently_closed_pages = data->recently_closed_pages_;
   }
 
+  // Delete the content in JumpListIcons folder and log the results to UMA.
+  DeleteDirectoryContentAndLogResults(icon_dir, kFileDeleteLimit);
+
   // Create a new JumpList and replace the current JumpList with it. The
   // jumplist links are updated anyway, while the jumplist icons may not as
   // mentioned above.
   UpdateJumpList(app_id.c_str(), icon_dir, local_most_visited_pages,
                  local_recently_closed_pages, incognito_availability);
 }
 
 }  // namespace
 
 JumpList::JumpListData::JumpListData() {}
@@ skipping 309 matching lines @@
 
 void JumpList::DeferredRunUpdate() {
   DCHECK(CalledOnValidThread());
 
   TRACE_EVENT0("browser", "JumpList::DeferredRunUpdate");
   // Check if incognito windows (or normal windows) are disabled by policy.
   IncognitoModePrefs::Availability incognito_availability =
       profile_ ? IncognitoModePrefs::GetAvailability(profile_->GetPrefs())
                : IncognitoModePrefs::ENABLED;
 
-  // Post a task to delete the content in JumpListIcons folder and log the
-  // results to UMA.
-  update_jumplisticons_task_runner_->PostTask(
-      FROM_HERE, base::Bind(&DeleteDirectoryContentAndLogResults, icon_dir_,
-                            kFileDeleteLimit));
-
-  // Post a task to update the jumplist used by the shell.
+  // Post a task to update the jumplist in JumpListIcons folder, which consists
+  // of 1) delete old icons, 2) create new icons, 3) notify the OS.
   update_jumplisticons_task_runner_->PostTask(
       FROM_HERE, base::Bind(&RunUpdateJumpList, incognito_availability, app_id_,
                             icon_dir_, base::RetainedRef(jumplist_data_)));
 
   // Post a task to delete JumpListIconsOld folder and log the results to UMA.
   base::FilePath icon_dir_old = icon_dir_.DirName().Append(
       icon_dir_.BaseName().value() + FILE_PATH_LITERAL("Old"));
 
   delete_jumplisticonsold_task_runner_->PostTask(
       FROM_HERE, base::Bind(&DeleteDirectoryAndLogResults,
                             std::move(icon_dir_old), kFileDeleteLimit));
 }
 
 void JumpList::TopSitesLoaded(history::TopSites* top_sites) {
 }
 
 void JumpList::TopSitesChanged(history::TopSites* top_sites,
                                ChangeReason change_reason) {
   top_sites->GetMostVisitedURLs(
       base::Bind(&JumpList::OnMostVisitedURLsAvailable,
                  weak_ptr_factory_.GetWeakPtr()),
       false);
 }