Makes Ctrl-Shift-L work in AppList

ash/shell/shell_main.cc

Index: ash/shell/shell_main.cc
diff --git a/ash/shell/shell_main.cc b/ash/shell/shell_main.cc
index 4837071bfc99fd6a9a945c90aa4e79e1bc169423..e97b790077051a40d601b251a76e08f86d4a78ab 100644
--- a/ash/shell/shell_main.cc
+++ b/ash/shell/shell_main.cc
@@ -58,6 +58,12 @@ class ShellDelegateImpl : public ash::ShellDelegate {
     return ash::internal::CreateStatusArea();
   }
 
+#if defined(CHROME_OS)
+ virtual void LockScreen() OVERRIDE {
+   ash::shell::CreateLockScreen();
+ }
+#endif
+
   virtual void BuildAppListModel(ash::AppListModel* model) OVERRIDE {
     ash::shell::BuildAppListModel(model);
   }