Address bar is shown on pop-out extension windows.

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2011 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/extensions/extension_host.h"
 
 #include <list>
 
 #include "base/memory/singleton.h"
 #include "base/message_loop.h"
@@ skipping 568 matching lines @@
   if (disposition == NEW_POPUP) {
     // Find a browser with a matching profile for creating a popup.
     // (If none is found, NULL argument to NavigateParams is valid.)
     Browser* browser = BrowserList::FindTabbedBrowser(
         contents->profile(),
         false);  // Match incognito exactly.
     TabContentsWrapper* wrapper = new TabContentsWrapper(contents);
     browser::NavigateParams params(browser, wrapper);
     if (!browser)
       params.profile = contents->profile();
+    // The extension_app_id parameter ends up as app_name in the Browser
+    // which causes the Browser to return true for is_app().  This affects
+    // among other things, whether the location bar gets displayed.
+    params.extension_app_id = extension_id_;
     params.disposition = NEW_POPUP;
     params.window_bounds = initial_pos;
     params.window_action = browser::NavigateParams::SHOW_WINDOW;
     params.user_gesture = user_gesture;
     browser::Navigate(&params);
     return;
   }
 
   // If the tab contents isn't a popup, it's a normal tab. We need to find a
   // home for it. This is typically a Browser, but it can also be some other
@@ skipping 211 matching lines @@
   return window_id;
 }
 
 void ExtensionHost::OnRunFileChooser(
     const ViewHostMsg_RunFileChooser_Params& params) {
   if (file_select_helper_.get() == NULL)
     file_select_helper_.reset(new FileSelectHelper(profile()));
   file_select_helper_->RunFileChooser(render_view_host_,
                                       GetAssociatedTabContents(), params);
 }