Refactor the various ways to control what users can do to extensions.

chrome/browser/ui/webui/ntp/app_launcher_handler.cc

Index: chrome/browser/ui/webui/ntp/app_launcher_handler.cc
===================================================================
--- chrome/browser/ui/webui/ntp/app_launcher_handler.cc	(revision 138227)
+++ chrome/browser/ui/webui/ntp/app_launcher_handler.cc	(working copy)
@@ -24,6 +24,7 @@
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_sorting.h"
+#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
@@ -114,6 +115,10 @@
       !service->GetTerminatedExtension(extension->id());
   extension->GetBasicInfo(enabled, value);
 
+  value->SetBoolean("mayDisable", ExtensionSystem::Get(
+        service->profile())->management_policy()->UserMayModifyStatus(
+        extension, NULL));
+
   bool icon_big_exists = true;
   // Instead of setting grayscale here, we do it in apps_page.js.
   GURL icon_big =
@@ -604,7 +609,9 @@
   if (!extension)
     return;
 
-  if (!Extension::UserMayDisable(extension->location())) {
+  if (!ExtensionSystem::Get(
+      extension_service_->profile())->management_policy()
+      ->UserMayModifyStatus(extension, NULL)) {
     LOG(ERROR) << "Attempt to uninstall an extension that is non-usermanagable "
                << "was made. Extension id : " << extension->id();
     return;