* Output of `node_modules/.bin/electron --version`: v5.0.0-nightly.20190107
* Operating System (Platform and Version): macOS Mojave 10.14.2 (18C54)
* Output of `node_modules/.bin/electron --version` on last known working Electron version (if applicable): never

**Expected Behavior**
Using navigator.mediaDevices.getDisplayMedia({ video: true }), a native screen picker should appear.

**Actual behavior**
The following error is thrown: NotAllowedError: Permission denied

**Screenshots**
Expected dialog
![image](https://user-images.githubusercontent.com/1120050/51625551-71736500-1f0b-11e9-9a95-1406cad95046.png)
atom/browser/atom_browser_client.cc
#include "v8/include/v8.h"
#if defined(USE_NSS_CERTS)
#include "net/ssl/client_cert_store_nss.h"
#elif defined(OS_WIN)
#include "net/ssl/client_cert_store_win.h"
#elif defined(OS_MACOSX)
#include "net/ssl/client_cert_store_mac.h"
#elif defined(USE_OPENSSL)
#include "net/ssl/client_cert_store.h"
#endif
#if BUILDFLAG(ENABLE_PEPPER_FLASH)
#include "chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h"
#endif  
#if BUILDFLAG(OVERRIDE_LOCATION_PROVIDER)
#include "atom/browser/fake_location_provider.h"
#endif  
#if BUILDFLAG(ENABLE_TTS)
#include "chrome/browser/speech/tts_controller_delegate_impl.h"
#include "chrome/browser/speech/tts_message_filter.h"
#endif  
#if BUILDFLAG(ENABLE_PRINTING)
#include "chrome/browser/printing/printing_message_filter.h"
#include "chrome/services/printing/public/mojom/constants.mojom.h"
#include "components/services/pdf_compositor/public/interfaces/pdf_compositor.mojom.h"
#endif  
using content::BrowserThread;
namespace atom {
namespace {
bool g_suppress_renderer_process_restart = false;
bool IsSameWebSite(content::BrowserContext* browser_context,