Moved some functions off ExtensionService into a new file extension_util.

chrome/browser/extensions/event_router.cc

Index: chrome/browser/extensions/event_router.cc
diff --git a/chrome/browser/extensions/event_router.cc b/chrome/browser/extensions/event_router.cc
index b547a33b77bec7043c5e8f1abe907b870f6d655c..b5e88bf4e10280250b1ef46aa67c6c91af87e4a6 100644
--- a/chrome/browser/extensions/event_router.cc
+++ b/chrome/browser/extensions/event_router.cc
@@ -22,6 +22,7 @@
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/lazy_background_task_queue.h"
 #include "chrome/browser/extensions/process_map.h"
 #include "chrome/browser/profiles/profile.h"
@@ -631,9 +632,9 @@ bool EventRouter::CanDispatchEventToProfile(Profile* profile,
   // incognito tab event sent to a normal process, or vice versa).
   bool cross_incognito =
       event->restrict_to_profile && profile != event->restrict_to_profile;
-  if (cross_incognito &&
-      !ExtensionSystem::Get(profile)->extension_service()->
-          CanCrossIncognito(extension)) {
+  if (cross_incognito && !extension_util::CanCrossIncognito(
+          extension,
+          ExtensionSystem::Get(profile)->extension_service())) {
     return false;
   }