Revert 113071 - Revert 113047 - Make ExtensionService use ExtensionSet.

chrome/browser/ui/views/location_bar/location_bar_view.cc

Index: chrome/browser/ui/views/location_bar/location_bar_view.cc
===================================================================
--- chrome/browser/ui/views/location_bar/location_bar_view.cc	(revision 113231)
+++ chrome/browser/ui/views/location_bar/location_bar_view.cc	(working copy)
@@ -925,9 +925,10 @@
   // Remember the previous visibility of the page actions so that we can
   // notify when this changes.
   std::vector<ExtensionAction*> page_actions;
-  for (size_t i = 0; i < service->extensions()->size(); ++i) {
-    if (service->extensions()->at(i)->page_action())
-      page_actions.push_back(service->extensions()->at(i)->page_action());
+  for (ExtensionSet::const_iterator it = service->extensions()->begin();
+       it != service->extensions()->end(); ++it) {
+    if ((*it)->page_action())
+      page_actions.push_back((*it)->page_action());
   }
 
   // On startup we sometimes haven't loaded any extensions. This makes sure