Delete test view delegate at end of test

views/controls/textfield/textfield_views_model_unittest.cc

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
 #include "base/scoped_ptr.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/clipboard/scoped_clipboard_writer.h"
@@ skipping 271 matching lines @@
   EXPECT_EQ(7U, model.cursor_pos());
 
   model.SetText(ASCIIToUTF16("BYE"));
   EXPECT_EQ(3U, model.cursor_pos());
   EXPECT_EQ(string16(), model.GetSelectedText());
   model.SetText(ASCIIToUTF16(""));
   EXPECT_EQ(0U, model.cursor_pos());
 }
 
 TEST(TextfieldViewsModelTest, Clipboard) {
-  views::ViewsDelegate::views_delegate = new TestViewsDelegate();
+  scoped_ptr<TestViewsDelegate> test_views_delegate(new TestViewsDelegate());
+  views::ViewsDelegate* original_delegate =
+      views::ViewsDelegate::views_delegate;
+  views::ViewsDelegate::views_delegate = test_views_delegate.get();
   ui::Clipboard* clipboard
       = views::ViewsDelegate::views_delegate->GetClipboard();
   string16 initial_clipboard_text;
   clipboard->ReadText(ui::Clipboard::BUFFER_STANDARD, &initial_clipboard_text);
   string16 clipboard_text;
   TextfieldViewsModel model;
   model.Append(ASCIIToUTF16("HELLO WORLD"));
   model.MoveCursorToEnd(false);
 
   // Test for cut: Empty selection.
@@ skipping 29 matching lines @@
 
   // Test for paste.
   model.ClearSelection();
   model.MoveCursorToEnd(false);
   model.MoveCursorToPreviousWord(true);
   EXPECT_TRUE(model.Paste());
   clipboard->ReadText(ui::Clipboard::BUFFER_STANDARD, &clipboard_text);
   EXPECT_STR_EQ("HELLO HELLO WORLD", clipboard_text);
   EXPECT_STR_EQ("HELLO HELLO HELLO HELLO WORLD", model.text());
   EXPECT_EQ(29U, model.cursor_pos());
+
+  // Restore original delegate.
+  views::ViewsDelegate::views_delegate = original_delegate;
 }
 
 }  // namespace views