Don't use browser windows for platform app shell windows

chrome/browser/extensions/extension_host.cc

Index: chrome/browser/extensions/extension_host.cc
diff --git a/chrome/browser/extensions/extension_host.cc b/chrome/browser/extensions/extension_host.cc
index 4763b17812c383973170fe0145d37cd27621ed15..0a6e94d243d86d3294ece99f0734f30199cdf67c 100644
--- a/chrome/browser/extensions/extension_host.cc
+++ b/chrome/browser/extensions/extension_host.cc
@@ -332,7 +332,8 @@ void ExtensionHost::DidStopLoading() {
   did_stop_loading_ = true;
   if (extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_POPUP ||
       extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_DIALOG ||
-      extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR) {
+      extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR ||
+      extension_host_type_ == chrome::VIEW_TYPE_APP_SHELL) {
 #if defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
     if (view_.get())
       view_->DidStopLoading();
@@ -355,6 +356,8 @@ void ExtensionHost::DidStopLoading() {
     } else if (extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR) {
       UMA_HISTOGRAM_TIMES("Extensions.InfobarLoadTime",
         since_created_.Elapsed());
+    } else if (extension_host_type_ == chrome::VIEW_TYPE_APP_SHELL) {
+      UMA_HISTOGRAM_TIMES("Extensions.ShellLoadTime", since_created_.Elapsed());
     }
   }
 }
@@ -390,7 +393,8 @@ void ExtensionHost::CloseContents(TabContents* contents) {
   if (extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_POPUP ||
       extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_DIALOG ||
       extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE ||
-      extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR) {
+      extension_host_type_ == chrome::VIEW_TYPE_EXTENSION_INFOBAR ||
+      extension_host_type_ == chrome::VIEW_TYPE_APP_SHELL) {
     content::NotificationService::current()->Notify(
         chrome::NOTIFICATION_EXTENSION_HOST_VIEW_SHOULD_CLOSE,
         content::Source<Profile>(profile_),