Remove some more !IsModeMaterial code.

chrome/browser/ui/BUILD.gn

 # Copyright 2014 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("//build/config/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1612 matching lines @@
         "views/download/download_item_view.cc",
         "views/download/download_item_view.h",
         "views/download/download_shelf_context_menu_view.cc",
         "views/download/download_shelf_context_menu_view.h",
         "views/download/download_shelf_view.cc",
         "views/download/download_shelf_view.h",
         "views/download/download_started_animation_views.cc",
         "views/dropdown_bar_host.cc",
         "views/dropdown_bar_host.h",
         "views/dropdown_bar_host_delegate.h",
-        "views/dropdown_bar_view.cc",
-        "views/dropdown_bar_view.h",
         "views/elevation_icon_setter.cc",
         "views/elevation_icon_setter.h",
         "views/find_bar_host.cc",
         "views/find_bar_host.h",
         "views/find_bar_view.cc",
         "views/find_bar_view.h",
         "views/first_run_bubble.cc",
         "views/first_run_bubble.h",
         "views/frame/browser_command_handler_linux.cc",
         "views/frame/browser_command_handler_linux.h",
@@ skipping 1771 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }