Reland: Refactor code that defers extension background page loading

apps/shell/browser/shell_extensions_browser_client.cc

Index: apps/shell/browser/shell_extensions_browser_client.cc
diff --git a/apps/shell/browser/shell_extensions_browser_client.cc b/apps/shell/browser/shell_extensions_browser_client.cc
index 76f4a83b660680c8cd0a3cc51d02bebe56756dc2..54b0df84fcac9969c66d47e8d1be7324ce8b2c3c 100644
--- a/apps/shell/browser/shell_extensions_browser_client.cc
+++ b/apps/shell/browser/shell_extensions_browser_client.cc
@@ -183,14 +183,9 @@ 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>