Stop using browserless panels by default beyond trunk.

Need to get window.open() working for browserless panels before baking in canary/dev.

BUG=143506
TEST=None

Review URL: https://chromiumcodereview.appspot.com/10829402

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152190 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/panels/panel_manager.cc

@@ -93,7 +93,8 @@ bool PanelManager::UseBrowserlessPanels() {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kOldPanels))
     return false;
 
-  return chrome::VersionInfo::GetChannel() <= chrome::VersionInfo::CHANNEL_DEV;
+  return chrome::VersionInfo::GetChannel() <=
+      chrome::VersionInfo::CHANNEL_UNKNOWN;
 }
 
 PanelManager::PanelManager()