Make ExtensionService use ExtensionSet.

chrome/browser/extensions/extension_toolbar_model.cc

Index: chrome/browser/extensions/extension_toolbar_model.cc
diff --git a/chrome/browser/extensions/extension_toolbar_model.cc b/chrome/browser/extensions/extension_toolbar_model.cc
index 6f8c6956ccd5adb6da4a6196f97237520a30efda..24f96290eb282168fecbf3257c3e9d152508278d 100644
--- a/chrome/browser/extensions/extension_toolbar_model.cc
+++ b/chrome/browser/extensions/extension_toolbar_model.cc
@@ -181,8 +181,9 @@ void ExtensionToolbarModel::InitializeExtensionList() {
   ExtensionList unsorted;
 
   // Create the lists.
-  for (size_t i = 0; i < service_->extensions()->size(); ++i) {
-    const Extension* extension = service_->extensions()->at(i);
+  for (ExtensionSet::const_iterator it = service_->extensions()->begin();
+       it != service_->extensions()->end(); ++it) {
+    const Extension* extension = *it;
     if (!extension->browser_action())
       continue;
     if (!service_->GetBrowserActionVisibility(extension))