Fix for Ash shortcuts unexpectedly working in system model dialog

ash/accelerators/accelerator_table.cc

Index: ash/accelerators/accelerator_table.cc
diff --git a/ash/accelerators/accelerator_table.cc b/ash/accelerators/accelerator_table.cc
index 35a60ae5e3f6f572acd0545ca283cace2a4f7991..bd50541879028df7a0748a1462a0f5236de45988 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -253,4 +253,41 @@ const AcceleratorAction kActionsAllowedAtLockScreen[] = {
 const size_t kActionsAllowedAtLockScreenLength =
     arraysize(kActionsAllowedAtLockScreen);
 
+const AcceleratorAction kActionsAllowedAtModalWindow[] = {
+  BRIGHTNESS_DOWN,
+  BRIGHTNESS_UP,
+  DISABLE_CAPS_LOCK,
+  EXIT,
+  KEYBOARD_BRIGHTNESS_DOWN,
+  KEYBOARD_BRIGHTNESS_UP,
+  MAGNIFY_SCREEN_ZOOM_IN,
+  MAGNIFY_SCREEN_ZOOM_OUT,
+  MEDIA_NEXT_TRACK,
+  MEDIA_PLAY_PAUSE,
+  MEDIA_PREV_TRACK,
+  NEXT_IME,
+  OPEN_FEEDBACK_PAGE,
+  POWER_PRESSED,
+  POWER_RELEASED,
+  PREVIOUS_IME,
+  SHOW_KEYBOARD_OVERLAY,
+  SWAP_PRIMARY_DISPLAY,
+  SWITCH_IME,
+  TAKE_SCREENSHOT,
+  TAKE_PARTIAL_SCREENSHOT,
+  TOGGLE_CAPS_LOCK,
+  TOGGLE_SPOKEN_FEEDBACK,
+  TOGGLE_WIFI,
+  VOLUME_DOWN,
+  VOLUME_MUTE,
+  VOLUME_UP,
+#if defined(OS_CHROMEOS)
+  CYCLE_DISPLAY_MODE,
+  LOCK_SCREEN,
+#endif
+};
+
+const size_t kActionsAllowedAtModalWindowLength =
+    arraysize(kActionsAllowedAtModalWindow);
+
 }  // namespace ash