Google has made another option available to delete a file from your Drive. Instead of being in the list view in your Google Drive, you can now have the file open and select 'File' from the menu, then 'Move to Trash' to delete it.
In this example, I have a document opened named Keyboard Shortcuts. I click on the 'File' menu, then select 'Move to Trash' to delete it. The file will move into the trash folder.