Prevent creating background pages for non-incognito profile in Guest mode

extensions/browser/extensions_browser_client.h

 // Copyright 2013 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.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include "base/memory/scoped_ptr.h"
 
 class CommandLine;
@@ skipping 50 matching lines @@
       content::BrowserContext* context) = 0;
 
   // Returns the PrefService associated with |context|.
   virtual PrefService* GetPrefServiceForContext(
       content::BrowserContext* context) = 0;
 
   // Returns true if loading background pages should be deferred.
   virtual bool DeferLoadingBackgroundHosts(
       content::BrowserContext* context) const = 0;
 
+  virtual bool IsBackgroundPageAllowed(
+      content::BrowserContext* context) const = 0;
+
   // Returns true if the client version has updated since the last run. Called
   // once each time the extensions system is loaded per browser_context. The
   // implementation may wish to use the BrowserContext to record the current
   // version for later comparison.
   virtual bool DidVersionUpdate(content::BrowserContext* context) = 0;
 
   // Creates a new AppSorting instance.
   virtual scoped_ptr<AppSorting> CreateAppSorting() = 0;
 
   // Return true if the system is run in forced app mode.
   virtual bool IsRunningInForcedAppMode() = 0;
 
   // Returns the embedder's JavaScriptDialogManager or NULL if the embedder
   // does not support JavaScript dialogs.
   virtual content::JavaScriptDialogManager* GetJavaScriptDialogManager() = 0;
 
   // Returns the single instance of |this|.
   static ExtensionsBrowserClient* Get();
 
   // Initialize the single instance.
   static void Set(ExtensionsBrowserClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_