Disallow display of multiple experimental.extension.popup(...) windows

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2010 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 "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 422 matching lines @@
         InsertThemedToolstripCSS();
 
         // Listen for browser changes so we can resend the CSS.
         registrar_.Add(this, NotificationType::BROWSER_THEME_CHANGED,
                        NotificationService::AllSources());
         break;
       default:
         break;  // No style sheet for other types, at the moment.
     }
   }
+}
 
+void ExtensionHost::DocumentOnLoadCompletedInMainFrame(RenderViewHost* rvh) {
   if (ViewType::EXTENSION_POPUP == GetRenderViewType()) {
     NotificationService::current()->Notify(
         NotificationType::EXTENSION_POPUP_VIEW_READY,
         Source<Profile>(profile_),
         Details<ExtensionHost>(this));
   }
 }
 
 void ExtensionHost::RunJavaScriptMessage(const std::wstring& message,
                                          const std::wstring& default_prompt,
@@ skipping 266 matching lines @@
     // Extensions hosted in ExternalTabContainer objects may not have
     // an associated browser.
     Browser* browser = GetBrowser();
     if (browser)
       window_id = ExtensionTabUtil::GetWindowId(browser);
   } else if (extension_host_type_ != ViewType::EXTENSION_BACKGROUND_PAGE) {
     NOTREACHED();
   }
   return window_id;
 }