Moved some functions off ExtensionService into a new file extension_util.

chrome/browser/extensions/api/preference/preference_helpers.cc

Index: chrome/browser/extensions/api/preference/preference_helpers.cc
diff --git a/chrome/browser/extensions/api/preference/preference_helpers.cc b/chrome/browser/extensions/api/preference/preference_helpers.cc
index 8649f8eb04323ca5e72d0acef5ac2fedb314a2af..162e2ae862067f8127cb9d2e2ffe9b73d013f5ce 100644
--- a/chrome/browser/extensions/api/preference/preference_helpers.cc
+++ b/chrome/browser/extensions/api/preference/preference_helpers.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/extensions/extension_prefs.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/profiles/profile.h"
 #include "chrome/common/extensions/incognito_handler.h"
 
@@ -102,7 +103,7 @@ void DispatchEventToExtensions(
     if (router->ExtensionHasEventListener(extension_id, event_name) &&
         (*it)->HasAPIPermission(permission) &&
         (!incognito || IncognitoInfo::IsSplitMode(it->get()) ||
-         extension_service->CanCrossIncognito(it->get()))) {
+         extension_util::CanCrossIncognito(it->get(), extension_service))) {
       // Inject level of control key-value.
       base::DictionaryValue* dict;
       bool rv = args->GetDictionary(0, &dict);
@@ -118,7 +119,9 @@ void DispatchEventToExtensions(
       Profile* restrict_to_profile = NULL;
       bool from_incognito = false;
       if (IncognitoInfo::IsSplitMode(it->get())) {
-        if (incognito && extension_service->IsIncognitoEnabled(extension_id)) {
+        if (incognito &&
+            extension_util::IsIncognitoEnabled(extension_id,
+                                               extension_service)) {
           restrict_to_profile = profile->GetOffTheRecordProfile();
         } else if (!incognito &&
                    PreferenceAPI::Get(profile)->DoesExtensionControlPref(