[CUPS] Implement the "Printers" section in chrome://settings.

chrome/browser/ui/webui/print_preview/print_preview_ui.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/ui/webui/print_preview/print_preview_ui.h"
 
 #include <map>
 #include <vector>
 
 #include "base/feature_list.h"
@@ skipping 391 matching lines @@
   source->OverrideContentSecurityPolicyObjectSrc("object-src 'self';");
   source->AddLocalizedString("moreOptionsLabel", IDS_MORE_OPTIONS_LABEL);
   source->AddLocalizedString("lessOptionsLabel", IDS_LESS_OPTIONS_LABEL);
 
   bool scaling_enabled = base::FeatureList::IsEnabled(features::kPrintScaling);
   source->AddBoolean("scalingEnabled", scaling_enabled);
 
 #if defined(OS_CHROMEOS)
   bool cups_and_md_settings_enabled =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
-          ::switches::kEnableNativeCups) &&
-      base::FeatureList::IsEnabled(features::kMaterialDesignSettings);
+          ::switches::kEnableNativeCups);
   source->AddBoolean("showLocalManageButton", cups_and_md_settings_enabled);
 #else
   source->AddBoolean("showLocalManageButton", true);
 #endif
   return source;
 }
 
 PrintPreviewUI::TestingDelegate* g_testing_delegate = NULL;
 
 }  // namespace
@@ skipping 260 matching lines @@
 }
 
 void PrintPreviewUI::SetSelectedFileForTesting(const base::FilePath& path) {
   handler_->FileSelected(path, 0, NULL);
 }
 
 void PrintPreviewUI::SetPdfSavedClosureForTesting(
     const base::Closure& closure) {
   handler_->SetPdfSavedClosureForTesting(closure);
 }