MacViews: Consolidate flags. Just use --secondary-ui-md to enable MacViews.

chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm

Index: chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm
diff --git a/chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm b/chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm
index b2b322cd7ea24df2cb7498816246ebd4372ce91b..f764f82ea5fa64fd2d731d8fb63249d80218ecf9 100644
--- a/chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm
+++ b/chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_views.mm
@@ -2,16 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/cocoa/autofill/card_unmask_prompt_view_bridge.h"
 #include "chrome/browser/ui/views/autofill/card_unmask_prompt_views.h"
+#include "ui/base/material_design/material_design_controller.h"
 
 namespace autofill {
 
 CardUnmaskPromptView* CreateCardUnmaskPromptView(
     CardUnmaskPromptController* controller,
     content::WebContents* web_contents) {
-  if (chrome::ToolkitViewsWebUIDialogsEnabled())
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial())
     return new CardUnmaskPromptViews(controller, web_contents);
   return new CardUnmaskPromptViewBridge(controller, web_contents);
 }