MacViews: Enable views based External Protocol dialog behind secondary-ui-md flag.

chrome/test/BUILD.gn

Index: chrome/test/BUILD.gn
diff --git a/chrome/test/BUILD.gn b/chrome/test/BUILD.gn
index 32b170e9dd73dfdb90eb359d350cd8b7c89c356b..86105cbd2de4bc0a66fe7b77196fb3ca724d6343 100644
--- a/chrome/test/BUILD.gn
+++ b/chrome/test/BUILD.gn
@@ -2137,11 +2137,12 @@ test("browser_tests") {
         "../browser/ui/views/select_file_dialog_extension_browsertest.cc",
       ]
       deps += [ "//ui/views" ]
+      if (!is_chromeos) {
+        sources +=
+            [ "../browser/ui/views/external_protocol_dialog_browsertest.cc" ]
+      }
       if (!is_chromeos && (!is_mac || mac_views_browser)) {
-        sources += [
-          "../browser/ui/views/external_protocol_dialog_browsertest.cc",
-          "../browser/ui/views/profiles/profile_chooser_view_browsertest.cc",
-        ]
+        sources += [ "../browser/ui/views/profiles/profile_chooser_view_browsertest.cc" ]
       }
       if (!is_mac || mac_views_browser) {
         sources += [