Delete test view delegate at end of test

views/controls/textfield/textfield_views_model_unittest.cc

Index: views/controls/textfield/textfield_views_model_unittest.cc
diff --git a/views/controls/textfield/textfield_views_model_unittest.cc b/views/controls/textfield/textfield_views_model_unittest.cc
index 388c8c3953fb7e8bd6448f72036c251013c2af26..eff16eeff0feb3b3febb69beccc8249290d93c2b 100644
--- a/views/controls/textfield/textfield_views_model_unittest.cc
+++ b/views/controls/textfield/textfield_views_model_unittest.cc
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/auto_reset.h"
 #include "base/message_loop.h"
 #include "base/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
@@ -289,7 +290,9 @@ TEST(TextfieldViewsModelTest, SetText) {
 }
 
 TEST(TextfieldViewsModelTest, Clipboard) {
-  views::ViewsDelegate::views_delegate = new TestViewsDelegate();
+  scoped_ptr<TestViewsDelegate> test_views_delegate(new TestViewsDelegate());
+  AutoReset<views::ViewsDelegate*> auto_reset(
+      &views::ViewsDelegate::views_delegate, test_views_delegate.get());
   ui::Clipboard* clipboard
       = views::ViewsDelegate::views_delegate->GetClipboard();
   string16 initial_clipboard_text;