Reland: Refactor code that defers extension background page loading

apps/shell/browser/shell_extensions_browser_client.cc

 // 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.
 
 #include "apps/shell/browser/shell_extensions_browser_client.h"
 
 #include "apps/shell/browser/shell_app_sorting.h"
 #include "apps/shell/browser/shell_extension_system_factory.h"
 #include "apps/shell/browser/shell_extension_web_contents_observer.h"
 #include "apps/shell/browser/shell_runtime_api_delegate.h"
@@ skipping 165 matching lines @@
 
 PrefService* ShellExtensionsBrowserClient::GetPrefServiceForContext(
     BrowserContext* context) {
   return prefs_.get();
 }
 
 void ShellExtensionsBrowserClient::GetEarlyExtensionPrefsObservers(
     content::BrowserContext* context,
     std::vector<ExtensionPrefsObserver*>* observers) const {}
 
-bool ShellExtensionsBrowserClient::DeferLoadingBackgroundHosts(
-    BrowserContext* context) const {
-  return false;
-}
-
-bool ShellExtensionsBrowserClient::IsBackgroundPageAllowed(
-    BrowserContext* context) const {
-  return true;
+ProcessManagerDelegate*
+ShellExtensionsBrowserClient::GetProcessManagerDelegate() const {
+  return NULL;
 }
 
 scoped_ptr<ExtensionHostDelegate>
 ShellExtensionsBrowserClient::CreateExtensionHostDelegate() {
   return scoped_ptr<ExtensionHostDelegate>(new ShellExtensionHostDelegate);
 }
 
 bool ShellExtensionsBrowserClient::DidVersionUpdate(BrowserContext* context) {
   // TODO(jamescook): We might want to tell extensions when app_shell updates.
   return false;
@@ skipping 32 matching lines @@
     content::BrowserContext* context) const {
   return scoped_ptr<RuntimeAPIDelegate>(new apps::ShellRuntimeAPIDelegate());
 }
 
 ComponentExtensionResourceManager*
 ShellExtensionsBrowserClient::GetComponentExtensionResourceManager() {
   return NULL;
 }
 
 }  // namespace extensions