kiosk: Fix zoom crash regression.

chrome/browser/ui/views/apps/chrome_native_app_window_views.cc

Index: chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
diff --git a/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc b/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
index 44b62d1a0cde178f4ecd2afd521d43dd09f044a9..cdb6aeacc6da262a1aa4f4bf65643bf1bab3675b 100644
--- a/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
+++ b/chrome/browser/ui/views/apps/chrome_native_app_window_views.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/ui/views/apps/shaped_app_window_targeter.h"
 #include "chrome/browser/ui/views/extensions/extension_keybinding_registry_views.h"
 #include "chrome/browser/ui/views/frame/taskbar_decorator.h"
+#include "chrome/browser/ui/zoom/zoom_controller.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_switches.h"
 #include "extensions/common/extension.h"
@@ -273,6 +274,11 @@ void ChromeNativeAppWindowViews::InitializeDefaultWindow(
              arraysize(kAppWindowAcceleratorMap) +
                  arraysize(kAppWindowKioskAppModeAcceleratorMap));
 
+  // Ensure there is a ZoomController in kiosk mode, otherwise the processing
+  // of the accelerators will cause a crash.
+  DCHECK(!is_kiosk_app_mode ||
+         ZoomController::FromWebContents(web_view()->GetWebContents()));
+
   for (std::map<ui::Accelerator, int>::const_iterator iter =
            accelerator_table.begin();
        iter != accelerator_table.end(); ++iter) {