extensions: Check |enable_extensions| flag before depending on extension 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/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 195 matching lines @@
       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")
+      if (enable_extensions) {
+        sources += rebase_path(
+                gypi_values.chrome_browser_ui_views_extensions_non_mac_sources,
+                ".",
+                "//chrome")
+        deps += [ "//extensions/components/native_app_window" ]
+      }
       if (is_chromeos) {
         # TODO(GYP): crbug.com/481629. These files should probably not be
         # a part of ui_views_non_mac_sources at all.
         sources -= [
           "views/frame/opaque_browser_frame_view.cc",
           "views/frame/opaque_browser_frame_view.h",
           "views/frame/opaque_browser_frame_view_linux.cc",
           "views/frame/opaque_browser_frame_view_linux.h",
         ]
       }
@@ skipping 80 matching lines @@
     ]
     if (mac_views_browser) {
       sources += rebase_path(
               gypi_values.chrome_browser_ui_views_mac_experimental_sources,
               ".",
               "//chrome")
       sources +=
           rebase_path(gypi_values.chrome_browser_ui_views_non_mac_sources,
                       ".",
                       "//chrome")
+      sources += rebase_path(
+              gypi_values.chrome_browser_ui_views_extensions_non_mac_sources,
+              ".",
+              "//chrome")
+      deps += [ "//extensions/components/native_app_window" ]
     } else {
       sources += rebase_path(gypi_values.chrome_browser_ui_cocoa_sources,
                              ".",
                              "//chrome")
     }
     include_dirs = [ "$target_gen_dir" ]
     libs += [ "Quartz.framework" ]
     configs +=
         [ "//third_party/google_toolbox_for_mac:google_toolbox_for_mac_config" ]
   } else {  # non-Mac.
@@ skipping 188 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }