* Output of `node_modules/.bin/electron --version`: v4.0.0
* Operating System (Platform and Version): macOS 10.14.2

* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable): 2.0.7

### Expected behavior

I should be able to call `app.setAccessibilitySupportEnabled(true)` during initialization, and the application should start and stay open.

### Actual behavior

The application starts and exits immediately if `app.setAccessibilitySupportEnabled(true)` is called during initialization. Same for passing in `false`.

### How to reproduce

Here is a simple project that shows this error. The application behaves as expected (does not exit immediately) when this line is commented out:
https://github.com/marisademeglio/electron4-setA11yTreeEnabled/blob/master/src/main/main.js#L27

  $ git clone https://github.com/marisademeglio/electron4-setA11yTreeEnabled.git
  $ yarn install
  $ yarn start

atom/browser/api/atom_api_app.h
}  
namespace atom {
#if defined(OS_WIN)
enum class JumpListResult : int;
#endif
struct ProcessMetric {
  int type;
  base::ProcessId pid;
  std::unique_ptr<base::ProcessMetrics> metrics;
  ProcessMetric(int type,
                base::ProcessId pid,
                std::unique_ptr<base::ProcessMetrics> metrics);
  ~ProcessMetric();
};
namespace api {
class App : public AtomBrowserClient::Delegate,
            public mate::EventEmitter<App>,
            public BrowserObserver,
            public content::GpuDataManagerObserver,
            public content::BrowserChildProcessObserver {
 public:
  using FileIconCallback =
      base::Callback<void(v8::Local<v8::Value>, const gfx::Image&)>;
  static mate::Handle<App> Create(v8::Isolate* isolate);
  static void BuildPrototype(v8::Isolate* isolate,
                             v8::Local<v8::FunctionTemplate> prototype);
#if defined(USE_NSS_CERTS)
  void OnCertificateManagerModelCreated(
      std::unique_ptr<base::DictionaryValue> options,