* 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.cc
public:
  AppIdProcessIterator() : base::ProcessIterator(nullptr) {}
 protected:
  bool IncludeEntry() override {
    return (entry().parent_pid() == base::GetCurrentProcId() ||
            entry().pid() == base::GetCurrentProcId());
  }
};
IconLoader::IconSize GetIconSizeByString(const std::string& size) {
  if (size == "small") {
    return IconLoader::IconSize::SMALL;
  } else if (size == "large") {
    return IconLoader::IconSize::LARGE;
  }
  return IconLoader::IconSize::NORMAL;
}
int GetPathConstant(const std::string& name) {