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

chrome/chrome_tests_unit.gypi

Index: chrome/chrome_tests_unit.gypi
diff --git a/chrome/chrome_tests_unit.gypi b/chrome/chrome_tests_unit.gypi
index 28e00f26c958ea07beff38349301dce199abcfc5..a5dd6208c1ecdd4c800f782cb9ca2cfdafddb5ca 100644
--- a/chrome/chrome_tests_unit.gypi
+++ b/chrome/chrome_tests_unit.gypi
@@ -1092,10 +1092,12 @@
         'browser/media_galleries/media_folder_finder_unittest.cc',
         'browser/media_galleries/media_galleries_dialog_controller_mock.cc',
         'browser/media_galleries/media_galleries_dialog_controller_mock.h',
+        'browser/media_galleries/media_galleries_dialog_controller_test_util.cc',
+        'browser/media_galleries/media_galleries_dialog_controller_test_util.h',
         'browser/media_galleries/media_galleries_permission_controller_unittest.cc',
         'browser/media_galleries/media_galleries_permissions_unittest.cc',
         'browser/media_galleries/media_galleries_preferences_unittest.cc',
-        'browser/media_galleries/media_galleries_scan_result_dialog_controller_unittest.cc',
+        'browser/media_galleries/media_galleries_scan_result_controller_unittest.cc',
         'browser/media_galleries/media_scan_manager_unittest.cc',
         'browser/media_galleries/win/mtp_device_object_enumerator_unittest.cc',
         'browser/metrics/chrome_metrics_service_accessor_unittest.cc',
@@ -1601,7 +1603,6 @@
         'browser/ui/cocoa/extensions/extension_install_view_controller_unittest.mm',
         'browser/ui/cocoa/extensions/extension_installed_bubble_controller_unittest.mm',
         'browser/ui/cocoa/extensions/media_galleries_dialog_cocoa_unittest.mm',
-        'browser/ui/cocoa/extensions/media_galleries_scan_result_dialog_cocoa_unittest.mm',
         'browser/ui/cocoa/fast_resize_view_unittest.mm',
         'browser/ui/cocoa/find_bar/find_bar_bridge_unittest.mm',
         'browser/ui/cocoa/find_bar/find_bar_cocoa_controller_unittest.mm',