Remove views files from Mac GN build.

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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../../chrome_browser_ui.gypi") ],
@@ skipping 185 matching lines @@
   if (toolkit_views) {
     sources += rebase_path(gypi_values.chrome_browser_ui_views_sources,
                            ".",
                            "//chrome")
     deps += [ "//components/constrained_window" ]
 
     if (enable_extensions) {
       deps += [ "//extensions/components/native_app_window" ]
     }
 
-    if (!is_chromeos) {
+    if (!is_chromeos && (!is_mac || mac_views_browser)) {
       sources +=
           rebase_path(gypi_values.chrome_browser_ui_views_non_chromeos_sources,
                       ".",
                       "//chrome")
     }
     if (!is_mac) {
       sources +=
           rebase_path(gypi_values.chrome_browser_ui_views_non_mac_sources,
                       ".",
                       "//chrome")
@@ skipping 309 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }