Use code rather than name for custom error

src/project.coffee

@@ -283,7 +283,7 @@ class Project extends Model
   buildBuffer: (absoluteFilePath) ->
     if fs.getSizeSync(absoluteFilePath) >= 2 * 1048576 # 2MB
       error = new Error("Atom can only handle files < 2MB for now.")
-      error.name = 'OversizeFileError'
+      error.code = 'EFILETOOLARGE'
       throw error
 
     buffer = new TextBuffer({filePath: absoluteFilePath})

src/workspace.coffee

@@ -451,7 +451,7 @@ class Workspace extends Model
     try
       item ?= atom.project.open(uri, options)
     catch error
-      if error.name is 'OversizeFileError'
+      if error.code is 'EFILETOOLARGE'
         atom.notifications.addWarning(error.message + " Large file support is being tracked at [atom/atom#307](https://github.com/atom/atom/issues/307).")
       else if error.code is 'ENOENT' and error.path?
         atom.notifications.addWarning("No such file '#{error.path}'")