[chrome/browser/media] favor DCHECK_CURRENTLY_ON for better logs

chrome/browser/media/desktop_media_list_ash.cc

 // Copyright 2013 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/media/desktop_media_list_ash.h"
 
 #include <set>
 
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 131 matching lines @@
       observer_->OnSourceNameChanged(pos);
     }
     ++pos;
   }
 }
 
 void DesktopMediaListAsh::EnumerateWindowsForRoot(
     std::vector<DesktopMediaListAsh::SourceDescription>* sources,
     aura::Window* root_window,
     int container_id) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   aura::Window* container = ash::Shell::GetContainer(root_window, container_id);
   if (!container)
     return;
   for (aura::Window::Windows::const_iterator it = container->children().begin();
        it != container->children().end(); ++it) {
     if (!(*it)->IsVisible() || !(*it)->CanFocus())
       continue;
     content::DesktopMediaID id =
         content::DesktopMediaID::RegisterAuraWindow(*it);
     if (id.id == view_dialog_id_)
       continue;
     SourceDescription window_source(id, (*it)->title());
     sources->push_back(window_source);
 
     CaptureThumbnail(window_source.id, *it);
   }
 }
 
 void DesktopMediaListAsh::EnumerateSources(
     std::vector<DesktopMediaListAsh::SourceDescription>* sources) {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
 
   aura::Window::Windows root_windows = ash::Shell::GetAllRootWindows();
 
   for (size_t i = 0; i < root_windows.size(); ++i) {
     if (source_types_ & SCREENS) {
       SourceDescription screen_source(
           content::DesktopMediaID::RegisterAuraWindow(root_windows[i]),
           root_windows[i]->title());
 
       if (root_windows[i] == ash::Shell::GetPrimaryRootWindow())
@@ skipping 59 matching lines @@
   if (!pending_window_capture_requests_) {
     // Once we've finished capturing all windows post a task for the next list
     // update.
     BrowserThread::PostDelayedTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&DesktopMediaListAsh::Refresh,
                    weak_factory_.GetWeakPtr()),
         update_period_);
   }
 }