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 90a0e3582373aac009daf2e1893f47fbc60c7818..89b1bc02116e701810b4e2094c4ff1ca5bd2b7cd 100644
--- a/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
+++ b/chrome/browser/ui/views/extensions/media_galleries_dialog_views.cc
@@ -95,6 +95,17 @@ 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);