The [use custom session protocol spec](https://github.com/electron/electron/blob/fea165bef8e1edf99b6e1500da89d015e76cc8e1/spec/api-protocol-spec.js#L874) is curently crashing on master on Windows 64-bit.

For some reason it isn't failing the build though which is why it wasn't caught earlier, will look into that separately.

I bisected and it started happening in https://github.com/electron/electron/pull/9358

```
Backtrace:
        tracked_objects::ThreadData::next [0x00007FF959D9C964+1437860]
        purecall [0x00007FF96DD94A74+52]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94CA8C4B8+13298808]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94CA8C6A8+13299304]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94C612AB5+8606325]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94C612948+8605960]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94C610F34+8599284]
        tracked_objects::ThreadData::next [0x00007FF959C7372D+220781]
        tracked_objects::ThreadData::next [0x00007FF959CAD996+458966]
        tracked_objects::ThreadData::next [0x00007FF959CAC0D0+452624]
        tracked_objects::ThreadData::next [0x00007FF959CB0377+469687]
        tracked_objects::ThreadData::next [0x00007FF959CB0EA4+472548]
        tracked_objects::ThreadData::next [0x00007FF959CF4D1E+750686]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94C60A00F+8570831]
        ??1?$MessageT@UInputHostMsg_MoveCaret_ACK_Meta@@V?$tuple@$$V@std@@X@IPC@@UEAA@XZ [0x00007FF94C60AEB5+8574581]
        tracked_objects::ThreadData::next [0x00007FF959D34BF7+1012535]
        tracked_objects::ThreadData::next [0x00007FF959D28315+961109]
        BaseThreadInitThunk [0x00007FF97ABE8364+20]
        RtlUserThreadStart [0x00007FF97D5670D1+33]
```

/cc @deepak1556 
brightray/browser/browser_context.h
: partition(partition), in_memory(in_memory) {}
    bool operator<(const PartitionKey& other) const {
      if (partition == other.partition)
        return in_memory < other.in_memory;
      return partition < other.partition;
    }
    bool operator==(const PartitionKey& other) const {
      return (partition == other.partition) && (in_memory == other.in_memory);
    }
  };
  using BrowserContextMap =
      std::map<PartitionKey, base::WeakPtr<brightray::BrowserContext>>;
  static BrowserContextMap browser_context_map_;
  base::FilePath path_;
  bool in_memory_;
  DevToolsNetworkControllerHandle network_controller_handle_;
  std::unique_ptr<ResourceContext> resource_context_;
  scoped_refptr<URLRequestContextGetter> url_request_getter_;
  scoped_refptr<storage::SpecialStoragePolicy> storage_policy_;
  std::unique_ptr<PrefService> prefs_;
  std::unique_ptr<PermissionManager> permission_manager_;
  std::unique_ptr<MediaDeviceIDSalt> media_device_id_salt_;
  base::WeakPtrFactory<BrowserContext> weak_factory_;
  DISALLOW_COPY_AND_ASSIGN(BrowserContext);
};
}  
#endif