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

chrome/browser/ui/cocoa/login_handler_cocoa.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/login_handler_cocoa.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/browser/ui/browser_dialogs.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_custom_sheet.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_mac.h"
 #include "chrome/browser/ui/login/login_handler.h"
 #include "components/password_manager/core/browser/login_model.h"
 #include "components/password_manager/core/browser/password_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 #include "net/url_request/url_request.h"
 #include "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
+#include "ui/base/material_design/material_design_controller.h"
 
 using autofill::PasswordForm;
 using content::BrowserThread;
 using content::WebContents;
 
 // ----------------------------------------------------------------------------
 // LoginHandlerMac
 
 // This class simply forwards the authentication from the LoginView (on
 // the UI thread) to the net::URLRequest (on the I/O thread).
@@ skipping 92 matching lines @@
   base::scoped_nsobject<LoginHandlerSheet> sheet_controller_;
 
   std::unique_ptr<ConstrainedWindowMac> constrained_window_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginHandlerMac);
 };
 
 // static
 LoginHandler* LoginHandler::Create(net::AuthChallengeInfo* auth_info,
                                    net::URLRequest* request) {
-  if (chrome::ToolkitViewsWebUIDialogsEnabled())
+  if (ui::MaterialDesignController::IsSecondaryUiMaterial())
     return chrome::CreateLoginHandlerViews(auth_info, request);
   return new LoginHandlerMac(auth_info, request);
 }
 
 // ----------------------------------------------------------------------------
 // LoginHandlerSheet
 
 @implementation LoginHandlerSheet
 
 - (id)initWithLoginHandler:(LoginHandlerMac*)handler {
@@ skipping 53 matching lines @@
   // Resize the text field.
   CGFloat windowDelta = [GTMUILocalizerAndLayoutTweaker
        sizeToFitFixedWidthTextField:explanationField_];
 
   NSRect newFrame = [[self window] frame];
   newFrame.size.height += windowDelta;
   [[self window] setFrame:newFrame display:NO];
 }
 
 @end