* Electron Version: v3.0.0-beta.2
* Operating System (Platform and Version): macOS 10.13.5
* Last known working Electron version: v3.0.0-beta.1

**Expected Behavior**
Launching DevTools

**Actual behavior**
Electron crash with current dump:
```
Crashing on exception: *** -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]

Application Specific Backtrace 1:
0   CoreFoundation                      0x00007fff489d332b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x00007fff6fb41c76 objc_exception_throw + 48
2   CoreFoundation                      0x00007fff48a14634 _CFThrowFormattedException + 202
3   CoreFoundation                      0x00007fff488f2290 __CFStringDecodeByteStream3 + 0
4   Electron Framework                  0x000000010e7554c2 _ZN9brightray8IOThread7CleanUpEv + 2210
...
```

**Additional info** 
`BrowserWindow` should contain `titleBarStyle` with `hiddenInset` value.

Full dump attached to [link](https://github.com/electron/electron/files/2185677/dump.txt)

atom/browser/api/atom_api_browser_window.cc
#include "atom/browser/api/atom_api_browser_window.h"
#include "atom/browser/browser.h"
#include "atom/browser/unresponsive_suppressor.h"
#include "atom/browser/web_contents_preferences.h"
#include "atom/browser/window_list.h"
#include "atom/common/api/api_messages.h"
#include "atom/common/api/constructor.h"
#include "atom/common/color_util.h"
#include "atom/common/native_mate_converters/callback.h"
#include "atom/common/native_mate_converters/value_converter.h"
#include "atom/common/options_switches.h"
#include "base/threading/thread_task_runner_handle.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/render_view_host.h"
#include "native_mate/dictionary.h"
#include "ui/gl/gpu_switching_manager.h"
#include "atom/common/node_includes.h"
namespace atom {
namespace api {
BrowserWindow::BrowserWindow(v8::Isolate* isolate,
                             v8::Local<v8::Object> wrapper,
                             const mate::Dictionary& options)
    : TopLevelWindow(isolate, options), weak_factory_(this) {
  mate::Handle<class WebContents> web_contents;