Support chrome.windows extension API events for browserless Panels.

chrome/browser/extensions/extension_service.h

Index: chrome/browser/extensions/extension_service.h
diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h
index 9537be656e3f4a53fed47738328cb7998b951df4..067aa4397b3e63e52551265939b816d81cd88949 100644
--- a/chrome/browser/extensions/extension_service.h
+++ b/chrome/browser/extensions/extension_service.h
@@ -56,6 +56,7 @@ class ExtensionFontSettingsEventRouter;
 class ExtensionGlobalError;
 class ExtensionManagedModeEventRouter;
 class ExtensionManagementEventRouter;
+class ExtensionPanelEventRouter;
 class ExtensionPreferenceEventRouter;
 class ExtensionSyncData;
 class ExtensionSystem;
@@ -803,6 +804,8 @@ class ExtensionService
 
   scoped_ptr<ExtensionBrowserEventRouter> browser_event_router_;
 
+  scoped_ptr<ExtensionPanelEventRouter> panel_event_router_;
+
   scoped_ptr<ExtensionPreferenceEventRouter> preference_event_router_;
 
   scoped_ptr<BookmarkExtensionEventRouter> bookmark_event_router_;