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

chrome/browser/ui/browser.h

Index: chrome/browser/ui/browser.h
diff --git a/chrome/browser/ui/browser.h b/chrome/browser/ui/browser.h
index c01143106f7886f53a6338d7f16db287b358cf77..faa4f2938602739c7cb2a12b122ceea8cd014446 100644
--- a/chrome/browser/ui/browser.h
+++ b/chrome/browser/ui/browser.h
@@ -99,6 +99,7 @@ class Browser : public TabHandlerDelegate,
     TYPE_TABBED = 1,
     TYPE_POPUP = 2,
     TYPE_PANEL = 3,
+    TYPE_SHELL = 4
   };
 
   // Possible elements of the Browser window.
@@ -856,6 +857,7 @@ class Browser : public TabHandlerDelegate,
   bool is_type_tabbed() const { return type_ == TYPE_TABBED; }
   bool is_type_popup() const { return type_ == TYPE_POPUP; }
   bool is_type_panel() const { return type_ == TYPE_PANEL; }
+  bool is_type_shell() const { return type_ == TYPE_SHELL; }
 
   bool is_app() const;
   bool is_devtools() const;