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

extensions/browser/process_manager.cc

Index: extensions/browser/process_manager.cc
diff --git a/extensions/browser/process_manager.cc b/extensions/browser/process_manager.cc
index 1eb2903d2b7e774ead5524b8e343e111b394d24d..1c408971c90c47da703acebe91f8adc30897aeb3 100644
--- a/extensions/browser/process_manager.cc
+++ b/extensions/browser/process_manager.cc
@@ -248,8 +248,11 @@ ExtensionHost* ProcessManager::CreateBackgroundHost(const Extension* extension,
                                                     const GURL& url) {
   // Hosted apps are taken care of from BackgroundContentsService. Ignore them
   // here.
-  if (extension->is_hosted_app())
+  if (extension->is_hosted_app() ||
+      !ExtensionsBrowserClient::Get()->
+          IsBackgroundPageAllowed(GetBrowserContext())) {
     return NULL;
+  }
 
   // Don't create multiple background hosts for an extension.
   if (ExtensionHost* host = GetBackgroundHostForExtension(extension->id()))
@@ -709,8 +712,11 @@ void ProcessManager::OnDevToolsStateChanged(
 }
 
 void ProcessManager::CreateBackgroundHostsForProfileStartup() {
-  if (startup_background_hosts_created_)
+  if (startup_background_hosts_created_ ||
+      !ExtensionsBrowserClient::Get()->
+          IsBackgroundPageAllowed(GetBrowserContext())) {
     return;
+  }
 
   ExtensionService* service = ExtensionSystem::GetForBrowserContext(
       GetBrowserContext())->extension_service();