Immediately open MTP and other eligible removable devices with media directory on mount.

ui/file_manager/file_manager/common/js/importer_common_unittest.js

Index: ui/file_manager/file_manager/common/js/importer_common_unittest.js
diff --git a/ui/file_manager/file_manager/common/js/importer_common_unittest.js b/ui/file_manager/file_manager/common/js/importer_common_unittest.js
index 0de976178f53701bb5ba085c02f7aa92d9f89d6b..d61067d28997de8d947342ec896464a07e11e1bb 100644
--- a/ui/file_manager/file_manager/common/js/importer_common_unittest.js
+++ b/ui/file_manager/file_manager/common/js/importer_common_unittest.js
@@ -43,8 +43,8 @@ function setUp() {
           'sd-fs',
           'Some SD Card');
   volumeManager = new MockVolumeManager();
-  volumeManager.volumeInfoList.push(cameraVolume);
-  volumeManager.volumeInfoList.push(sdVolume);
+  volumeManager.volumeInfoList.add(cameraVolume);
+  volumeManager.volumeInfoList.add(sdVolume);
   driveVolume = volumeManager.getCurrentProfileVolumeInfo(
       VolumeManagerCommon.VolumeType.DRIVE);
   cameraFileEntry = createFileEntry(cameraVolume, '/DCIM/poodles.jpg');