removed useless requires

original commit: fff692309edd4752c82cf4adab4c45a930d525ef

collects/rackunit/private/gui/gui.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require racket/class
          unstable/class-iop
-         racket/gui
+         racket/gui/base
          "../base.rkt"
          "../result.rkt"
          "../check-info.rkt"

collects/rackunit/private/gui/model2rml.rkt

@@ -2,9 +2,10 @@
 (require racket/class
          unstable/class-iop
          racket/list
-         racket/gui
+         racket/gui/base
          racket/match
          racket/file
+         racket/path
          mrlib/include-bitmap
          (prefix-in drlink: "drracket-ui.rkt")
          "interfaces.rkt"

collects/rackunit/private/gui/rml.rkt

@@ -1,7 +1,7 @@
 #lang racket/base
 (require racket/class
          unstable/class-iop
-         racket/gui
+         racket/gui/base
          framework
          "interfaces.rkt")
 

collects/rackunit/private/gui/view.rkt

@@ -3,7 +3,7 @@
          unstable/class-iop
          unstable/gui/notify
          racket/list
-         racket/gui
+         racket/gui/base
          framework
          mrlib/hierlist
          "interfaces.rkt"

collects/rackunit/tool.rkt

@@ -1,6 +1,6 @@
 #lang racket/base
 (require racket/class
-         racket/gui
+         racket/gui/base
          framework
          drscheme/tool
          racket/unit