Use the media galleries controller interface for the scan result dialog.

chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc

Index: chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
diff --git a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
index 89370f918eb67cd02300fe9a6c3f149d405f5002..67fa70360df4700a0774dd0364d097074f371de3 100644
--- a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
+++ b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
@@ -7,6 +7,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/views/constrained_window_views.h"
 #include "chrome/browser/ui/views/extensions/media_gallery_checkbox_view.h"
+#include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/generated_resources.h"
 #include "grit/locale_settings.h"
@@ -75,6 +76,17 @@ MediaGalleriesDialogViews::~MediaGalleriesDialogViews() {
     delete contents_;
 }
 
+void MediaGalleriesDialogViews::AcceptDialogForTesting() {
+  accepted_ = true;
+
+  web_modal::WebContentsModalDialogManager* web_contents_modal_dialog_manager =
+      web_modal::WebContentsModalDialogManager::FromWebContents(
+          controller_->WebContents());
+  DCHECK(web_contents_modal_dialog_manager);
+  web_modal::WebContentsModalDialogManager::TestApi(
+      web_contents_modal_dialog_manager).CloseAllDialogs();
+}
+
 void MediaGalleriesDialogViews::InitChildViews() {
   // Outer dialog layout.
   contents_->RemoveAllChildViews(true);