No browserless Panels unless enabled by flag.

chrome/browser/ui/panels/panel_manager.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.
 
 #include "chrome/browser/ui/panels/panel_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 75 matching lines @@
   }
 
   return true;
 }
 
 // static
 bool PanelManager::UseBrowserlessPanels() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kOldPanels))
     return false;
 
-  return chrome::VersionInfo::GetChannel() <=
-      chrome::VersionInfo::CHANNEL_UNKNOWN;
+  // http://crbug.com/143506
+  // TODO(jennb): Remove after channel check can be used.
+// return chrome::VersionInfo::GetChannel() <= chrome::VersionInfo::CHANNEL_DEV;
+  // For now, use former flag to turn on browserless panels.
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kBrowserlessPanels))
+    return true;
+
+  return false;
 }
 
 PanelManager::PanelManager()
     : panel_mouse_watcher_(PanelMouseWatcher::Create()),
       auto_sizing_enabled_(true) {
   // DisplaySettingsProvider should be created before the creation of strips
   // since some strip might depend on it.
   display_settings_provider_.reset(DisplaySettingsProvider::Create());
   display_settings_provider_->AddDisplayAreaObserver(this);
 
@@ skipping 249 matching lines @@
 void PanelManager::SetMouseWatcher(PanelMouseWatcher* watcher) {
   panel_mouse_watcher_.reset(watcher);
 }
 
 void PanelManager::OnPanelAnimationEnded(Panel* panel) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_PANEL_BOUNDS_ANIMATIONS_FINISHED,
       content::Source<Panel>(panel),
       content::NotificationService::NoDetails());
 }