* Electron version: 1.4.4
* Operating system: win10

Hi,
Example described [here](https://github.com/electron/electron/blob/master/docs/api/global-shortcut.md) works with v1.4.0 but doesn't seem to work with v1.4.4 or v1.4.5.  Method `globalShortcut.isRegistered ` returns true, but the callback isn't called. 

Thanks!
atom/browser/api/atom_api_system_preferences_win.cc
id = COLOR_3DLIGHT;
  } else if (color == "3d-shadow") {
    id = COLOR_3DSHADOW;
  } else if (color == "active-border") {
    id = COLOR_ACTIVEBORDER;
  } else if (color == "active-caption") {
    id = COLOR_ACTIVECAPTION;
  } else if (color == "active-caption-gradient") {
    id = COLOR_GRADIENTACTIVECAPTION;
  } else if (color == "app-workspace") {
    id = COLOR_APPWORKSPACE;
  } else if (color == "button-text") {
    id = COLOR_BTNTEXT;
  } else if (color == "caption-text") {
    id = COLOR_CAPTIONTEXT;
  } else if (color == "desktop") {
    id = COLOR_DESKTOP;
  } else if (color == "disabled-text") {
    id = COLOR_GRAYTEXT;
  } else if (color == "highlight") {
    id = COLOR_HIGHLIGHT;
  } else if (color == "highlight-text") {
    id = COLOR_HIGHLIGHTTEXT;
  } else if (color == "hotlight") {
    id = COLOR_HOTLIGHT;
  } else if (color == "inactive-border") {
    id = COLOR_INACTIVEBORDER;
  } else if (color == "inactive-caption") {
    id = COLOR_INACTIVECAPTION;
  } else if (color == "inactive-caption-gradient") {