fix: reset capturers at the very end (#20270)

patches/chromium/desktop_media_list.patch

@@ -133,7 +133,7 @@ index 47401abc984e6fe26c7f4c5399aa565c687060b0..ca6a527ffac877c27aac94337ec5a7b5
   protected:
    virtual ~DesktopMediaListObserver() {}
 diff --git a/chrome/browser/media/webrtc/native_desktop_media_list.cc b/chrome/browser/media/webrtc/native_desktop_media_list.cc
-index b2005c70acbc1c05c59bb2059b190ab78fb63a68..1a7188e2df76672d66da3206d4448df35a065754 100644
+index b2005c70acbc1c05c59bb2059b190ab78fb63a68..6cfc3007549b2e7992334b708e4e71a00974c2a3 100644
 --- a/chrome/browser/media/webrtc/native_desktop_media_list.cc
 +++ b/chrome/browser/media/webrtc/native_desktop_media_list.cc
 @@ -8,14 +8,15 @@
@@ -153,3 +153,12 @@ index b2005c70acbc1c05c59bb2059b190ab78fb63a68..1a7188e2df76672d66da3206d4448df3
  #include "media/base/video_util.h"
  #include "third_party/libyuv/include/libyuv/scale_argb.h"
  #include "third_party/skia/include/core/SkBitmap.h"
+@@ -218,6 +219,8 @@ void NativeDesktopMediaList::Worker::RefreshThumbnails(
+       FROM_HERE, {BrowserThread::UI},
+       base::BindOnce(&NativeDesktopMediaList::UpdateNativeThumbnailsFinished,
+                      media_list_));
++
++  capturer_.reset();
+ }
+ 
+ void NativeDesktopMediaList::Worker::OnCaptureResult(

shell/browser/api/atom_api_desktop_capturer.cc

@@ -144,7 +144,6 @@ void DesktopCapturer::UpdateSourcesList(DesktopMediaList* list) {
     }
     std::move(window_sources.begin(), window_sources.end(),
               std::back_inserter(captured_sources_));
-    window_capturer_.reset();
   }
 
   if (capture_screen_ &&
@@ -195,7 +194,6 @@ void DesktopCapturer::UpdateSourcesList(DesktopMediaList* list) {
     // individual screen support is added.
     std::move(screen_sources.begin(), screen_sources.end(),
               std::back_inserter(captured_sources_));
-    screen_capturer_.reset();
   }
 
   if (!capture_window_ && !capture_screen_)