cros: Add app mode restrictions.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 805496344fb026fa183c09d64939b98ea97653d5..6b57e1e47828fbdbce790377086546b0728b701a 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -4,11 +4,13 @@
 
 #include "ash/shell/shell_delegate_impl.h"
 
+#include <limits>
+
 #include "ash/caps_lock_delegate_stub.h"
 #include "ash/host/root_window_host_factory.h"
+#include "ash/shell/context_menu.h"
 #include "ash/shell/example_factory.h"
 #include "ash/shell/launcher_delegate_impl.h"
-#include "ash/shell/context_menu.h"
 #include "ash/shell/toplevel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_util.h"
@@ -49,6 +51,10 @@ bool ShellDelegateImpl::IsFirstRunAfterBoot() const {
   return false;
 }
 
+bool ShellDelegateImpl::IsRunningInForcedAppMode() const {
+  return false;
+}
+
 bool ShellDelegateImpl::CanLockScreen() const {
   return true;
 }