Custom Dialogs

[lramos15]

Issue Type: Bug

It appears that custom dialogs are on by default and unable to be turned off.

1. Edit a file
2. Close without saving

The popup will be a custom dialog and not the native one, setting "workbench.dialogs.customEnabled" to false also doesn't work.

VS Code version: Code - Insiders 1.36.0-insider (c3fe2d8, 2019-06-20T05:19:11.382Z)
OS version: Darwin x64 18.6.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8850H CPU @ 2.60GHz (12 x 2600)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_deferred_display_list: disabled_off skia_renderer: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: disabled_off webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	32.00GB (5.28GB free)
Process Argv
Screen Reader	no
VM	0%

[sbatten]

Benjamin Pasero (@bpasero) looks like DialogService was being double registered with browser and native versions.