Files.app: Disable eject button on MTP device.

ui/file_manager/file_manager/foreground/js/ui/directory_tree.js

Index: ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js b/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
index 8de559429e0da677a2a4536cd9b1f844ba8496da..e5e336cf4157c1c71465941d918f78d54aa75ddb 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/directory_tree.js
@@ -437,7 +437,9 @@ function VolumeItem(modelItem, tree) {
   item.setupIcon_(item.querySelector('.icon'), item.volumeInfo_);
 
   // Attach the "eject" icon if the volume is ejectable.
-  if (modelItem.volumeInfo_.source === VolumeManagerCommon.Source.DEVICE ||
+  if ((modelItem.volumeInfo_.source === VolumeManagerCommon.Source.DEVICE &&
+       modelItem.volumeInfo_.volumeType !==
+           VolumeManagerCommon.VolumeType.MTP) ||
       modelItem.volumeInfo_.source === VolumeManagerCommon.Source.FILE) {
     item.setupEjectButton_(item.rowElement);
   }