* Electron version: 2.0.0-beta.4
* Operating system: macOS 10.13.3

### Expected behavior

A reload of the window works.

### Actual behavior

A reload of the window does not work.

### How to reproduce

* run VSCode exploration ([download](https://az764295.vo.msecnd.net/exploration/6bc3274250cc949c7fb1d654cbb6e59c8ddad697/VSCode-darwin-exploration.zip))
* run "Reload Window" command
* sometimes I see the window stay blank after doing so and checking the console I see:

```
Uncaught (in promise) Error: Cannot get property 'id' on missing remote object 3
Error: Cannot get property 'id' on missing remote object 3
    at throwRPCError (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/rpc-server.js:143:17)
    at EventEmitter.<anonymous> (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/rpc-server.js:384:7)
    at emitThree (events.js:136:13)
    at EventEmitter.emit (events.js:217:7)
    at WebContents.<anonymous> (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/api/web-contents.js:295:13)
    at emitTwo (events.js:126:13)
    at WebContents.emit (events.js:214:7)
    at throwRPCError (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/rpc-server.js:143:17)
    at EventEmitter.<anonymous> (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/rpc-server.js:384:7)
    at emitThree (events.js:136:13)
    at EventEmitter.emit (events.js:217:7)
    at WebContents.<anonymous> (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/browser/api/web-contents.js:295:13)
    at emitTwo (events.js:126:13)
    at WebContents.emit (events.js:214:7)
    at Object.exception (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/renderer/api/remote.js:209:30)
    at metaToValue (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/renderer/api/remote.js:213:28)
    at Object.descriptor.get [as id] (/Applications/Visual Studio Code - Exploration.app/Contents/Resources/electron.asar/renderer/api/remote.js:132:16)
    at file:///Applications/Visual%20Studio%20Code%20-%20Exploration.app/Contents/Resources/app/out/vs/workbench/electron-browser/bootstrap/index.js:11:97
    at new Promise (<anonymous>)
    at file:///Applications/Visual%20Studio%20Code%20-%20Exploration.app/Contents/Resources/app/out/vs/workbench/electron-browser/bootstrap/index.js:10:838
```
atom/common/options_switches.cc
namespace switches {
const char kEnableSandbox[] = "enable-sandbox";
const char kEnableMixedSandbox[] = "enable-mixed-sandbox";
const char kEnablePlugins[] = "enable-plugins";
const char kPpapiFlashPath[] = "ppapi-flash-path";
const char kPpapiFlashVersion[] = "ppapi-flash-version";
const char kDisableHttpCache[] = "disable-http-cache";
const char kStandardSchemes[] = "standard-schemes";
const char kRegisterServiceWorkerSchemes[] = "register-service-worker-schemes";
const char kSecureSchemes[] = "secure-schemes";
const char kAppUserModelId[] = "app-user-model-id";
const char kAppPath[] = "app-path";
const char kBackgroundColor[]  = "background-color";
const char kPreloadScript[]    = "preload";
const char kPreloadURL[]       = "preload-url";
const char kPreloadScripts[]   = "preload-scripts";
const char kNodeIntegration[]  = "node-integration";
const char kContextIsolation[] = "context-isolation";
const char kGuestInstanceID[]  = "guest-instance-id";
const char kOpenerID[]         = "opener-id";
const char kScrollBounce[]     = "scroll-bounce";
const char kHiddenPage[]       = "hidden-page";
const char kNativeWindowOpen[] = "native-window-open";
const char kWebviewTag[]       = "webview-tag";
const char kNodeIntegrationInWorker[]  = "node-integration-in-worker";
const char kWidevineCdmPath[] = "widevine-cdm-path";
const char kWidevineCdmVersion[] = "widevine-cdm-version";
}  
}