Make ExtensionService use ExtensionSet.

chrome/browser/background/background_application_list_model.cc

Index: chrome/browser/background/background_application_list_model.cc
diff --git a/chrome/browser/background/background_application_list_model.cc b/chrome/browser/background/background_application_list_model.cc
index 6550ba2a300a03e0496471cbf2a4076d69f5e69b..d7d47403f30a05c6d3bd8974534d21a0ee856f41 100644
--- a/chrome/browser/background/background_application_list_model.cc
+++ b/chrome/browser/background/background_application_list_model.cc
@@ -71,9 +71,9 @@ class BackgroundApplicationListModel::Application
 namespace {
 void GetServiceApplications(ExtensionService* service,
                             ExtensionList* applications_result) {
-  const ExtensionList* extensions = service->extensions();
+  const ExtensionSet* extensions = service->extensions();
 
-  for (ExtensionList::const_iterator cursor = extensions->begin();
+  for (ExtensionSet::const_iterator cursor = extensions->begin();
        cursor != extensions->end();
        ++cursor) {
     const Extension* extension = *cursor;
@@ -84,7 +84,7 @@ void GetServiceApplications(ExtensionService* service,
   // Walk the list of terminated extensions also (just because an extension
   // crashed doesn't mean we should ignore it).
   extensions = service->terminated_extensions();
-  for (ExtensionList::const_iterator cursor = extensions->begin();
+  for (ExtensionSet::const_iterator cursor = extensions->begin();
        cursor != extensions->end();
        ++cursor) {
     const Extension* extension = *cursor;