Move c/c/e/extension_set to top-level extensions/

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 8cc820ca34cd9397ad9422abf33929fd435331bd..f64934427f445dcb5b7a26c72c31828cce8ec37b 100644
--- a/chrome/browser/extensions/extension_toolbar_model.cc
+++ b/chrome/browser/extensions/extension_toolbar_model.cc
@@ -25,6 +25,7 @@
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/common/extension.h"
+#include "extensions/common/extension_set.h"
 #include "extensions/common/feature_switch.h"
 
 using extensions::Extension;
@@ -336,7 +337,8 @@ void ExtensionToolbarModel::Populate(
       extensions::ExtensionActionManager::Get(profile_);
 
   // Create the lists.
-  for (ExtensionSet::const_iterator it = service->extensions()->begin();
+  for (extensions::ExtensionSet::const_iterator it =
+           service->extensions()->begin();
        it != service->extensions()->end(); ++it) {
     const Extension* extension = it->get();
     if (!extension_action_manager->GetBrowserAction(*extension))