Make platform apps use and require a different container ("shell" instead of "panel")

chrome/browser/ui/gtk/browser_titlebar.cc

Index: chrome/browser/ui/gtk/browser_titlebar.cc
diff --git a/chrome/browser/ui/gtk/browser_titlebar.cc b/chrome/browser/ui/gtk/browser_titlebar.cc
index fc31134faf701afc19f41ea13d65d4b10d0d95e4..499dd15be6b3e4ab99f23b31a2a83654e9a73ff6 100644
--- a/chrome/browser/ui/gtk/browser_titlebar.cc
+++ b/chrome/browser/ui/gtk/browser_titlebar.cc
@@ -624,6 +624,10 @@ void BrowserTitlebar::UpdateTitleAndIcon() {
         NOTREACHED() << "We should never have a tabbed app window.";
         break;
       }
+      case Browser::TYPE_SHELL: {
+        // Shell windows don't show titles and icons for now.
+        break;
+      }
       case Browser::TYPE_PANEL: {
         break;
       }