- Electron version: 1.4.0
- Operating system: OS X 10.10.5

I've been using the following code to send Tab key events to a webview in my project:

``` js
const webContents = webView.getWebContents();
const keyEvent = {
  type: 'keyDown',
  keyCode: 'Tab'
};

webContents.sendInputEvent(keyEvent);
```

I have had no issues with this until the recent update to 1.4.0.

The last version the above code works in OS X is **1.3.7**. I've tried this with the latest versions of Electron (1.4.1 & 1.4.2) with the same results.

Am I doing something wrong here? Is this a known issue?

atom/common/native_mate_converters/blink_converter.cc
mate::Dictionary dict = mate::Dictionary::CreateEmpty(isolate);
  dict.Set("inError",
      !!(mediaFlags & blink::WebContextMenuData::MediaInError));
  dict.Set("isPaused",
      !!(mediaFlags & blink::WebContextMenuData::MediaPaused));
  dict.Set("isMuted",
      !!(mediaFlags & blink::WebContextMenuData::MediaMuted));
  dict.Set("hasAudio",
      !!(mediaFlags & blink::WebContextMenuData::MediaHasAudio));
  dict.Set("isLooping",
      (mediaFlags & blink::WebContextMenuData::MediaLoop) != 0);
  dict.Set("isControlsVisible",
      (mediaFlags & blink::WebContextMenuData::MediaControls) != 0);
  dict.Set("canToggleControls",
      !!(mediaFlags & blink::WebContextMenuData::MediaCanToggleControls));
  dict.Set("canRotate",
      !!(mediaFlags & blink::WebContextMenuData::MediaCanRotate));
  return mate::ConvertToV8(isolate, dict);
}
v8::Local<v8::Value> Converter<blink::WebCache::ResourceTypeStat>::ToV8(