Remove ability to switch to pre-MD UI from about:flags.

chrome/browser/extensions/extension_action_icon_factory_unittest.cc

 // Copyright (c) 2012 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 "chrome/browser/extensions/extension_action_icon_factory.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 177 matching lines @@
   chromeos::ScopedTestCrosSettings test_cros_settings_;
   chromeos::ScopedTestUserManager test_user_manager_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionActionIconFactoryTest);
 };
 
 INSTANTIATE_TEST_CASE_P(
     ExtensionActionIconFactoryTest_MaterialDesign,
     ExtensionActionIconFactoryTest,
-    testing::Values(ui::MaterialDesignController::NON_MATERIAL,
-                    ui::MaterialDesignController::MATERIAL_NORMAL,
+    testing::Values(ui::MaterialDesignController::MATERIAL_NORMAL,
                     ui::MaterialDesignController::MATERIAL_HYBRID));
 
 // If there is no default icon, and the icon has not been set using |SetIcon|,
 // the factory should return favicon.
 TEST_P(ExtensionActionIconFactoryTest, NoIcons) {
   // Load an extension that has browser action without default icon set in the
   // manifest and does not call |SetIcon| by default.
   scoped_refptr<Extension> extension(CreateExtension(
       "browser_action/no_icon", Manifest::INVALID_LOCATION));
   ASSERT_TRUE(extension.get() != NULL);
@@ skipping 101 matching lines @@
   icon = icon_factory.GetIcon(1);
 
   EXPECT_TRUE(ImageRepsAreEqual(
       default_icon.ToImageSkia()->GetRepresentation(1.0f),
       icon.ToImageSkia()->GetRepresentation(1.0f)));
 
 }
 
 }  // namespace
 }  // namespace extensions