Reland: Refactor code that defers extension background page loading

apps/shell/browser/shell_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 APPS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_
 #define APPS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "extensions/browser/extensions_browser_client.h"
 
@@ skipping 41 matching lines @@
   virtual bool AllowCrossRendererResourceLoad(net::URLRequest* request,
                                               bool is_incognito,
                                               const Extension* extension,
                                               InfoMap* extension_info_map)
       OVERRIDE;
   virtual PrefService* GetPrefServiceForContext(
       content::BrowserContext* context) OVERRIDE;
   virtual void GetEarlyExtensionPrefsObservers(
       content::BrowserContext* context,
       std::vector<ExtensionPrefsObserver*>* observers) const OVERRIDE;
-  virtual bool DeferLoadingBackgroundHosts(content::BrowserContext* context)
-      const OVERRIDE;
-  virtual bool IsBackgroundPageAllowed(content::BrowserContext* context)
-      const OVERRIDE;
+  virtual ProcessManagerDelegate* GetProcessManagerDelegate() const OVERRIDE;
   virtual scoped_ptr<ExtensionHostDelegate> CreateExtensionHostDelegate()
       OVERRIDE;
   virtual bool DidVersionUpdate(content::BrowserContext* context) OVERRIDE;
   virtual scoped_ptr<AppSorting> CreateAppSorting() OVERRIDE;
   virtual bool IsRunningInForcedAppMode() OVERRIDE;
   virtual ApiActivityMonitor* GetApiActivityMonitor(
       content::BrowserContext* context) OVERRIDE;
   virtual ExtensionSystemProvider* GetExtensionSystemFactory() OVERRIDE;
   virtual void RegisterExtensionFunctions(
       ExtensionFunctionRegistry* registry) const OVERRIDE;
@@ skipping 11 matching lines @@
 
   // The PrefService for |browser_context_|.
   scoped_ptr<PrefService> prefs_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionsBrowserClient);
 };
 
 }  // namespace extensions
 
 #endif  // APPS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_