Add chrome/browser/extensions to "GN check"

extensions/shell/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/features.gni")
 import("//extensions/shell/app_shell.gni")
 
 # Technically, this directory should not depend on files from src/chrome, but
 # that's where the VERSION file is. This  should probably all be moved to
 # src/build.
@@ skipping 62 matching lines @@
 
     aura_sources = rebase_path(app_shell_gypi_values.app_shell_lib_sources_aura,
                                ".",
                                "//extensions/shell")
     sources += aura_sources
   }
 
   if (is_chromeos) {
     deps += [
       "//chromeos",
-      "//ui/chromeos:ui_chromeos",
+      "//ui/chromeos",
       "//ui/display",
     ]
     chromeos_sources =
         rebase_path(app_shell_gypi_values.app_shell_lib_sources_chromeos,
                     ".",
                     "//extensions/shell")
     sources += chromeos_sources
   }
 
   if (enable_nacl) {
@@ skipping 118 matching lines @@
     testonly = true
     sources = [
       "app/shell_main_mac.cc",
       "app/shell_main_mac.h",
     ]
     deps = [
       ":app_shell_lib",
     ]
   }
 }