Content "gn check" work.

gpu/config/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/chrome_build.gni")
 import("//build/config/ui.gni")
 
 declare_args() {
   # Use the PCI lib to collect GPU information on Linux.
   use_libpci = is_linux && !is_chromecast && (use_x11 || use_ozone)
 }
 
 group("config") {
   if (is_component_build) {
     public_deps = [
       "//gpu",
     ]
   } else {
     public_deps = [
       ":config_sources",
     ]
   }
 }
 
 source_set("config_sources") {
-  visibility = [
-    "//components/mus/gles2:*",
-    "//gpu/*",
-  ]
+  # External code should depend on this via //gpu/config above rather than
+  # depending on this directly or the component build will break.
+  visibility = [ "//gpu/*" ]
 
   sources = [
     "dx_diag_node.cc",
     "dx_diag_node.h",
     "gpu_blacklist.cc",
     "gpu_blacklist.h",
     "gpu_control_list.cc",
     "gpu_control_list.h",
     "gpu_control_list_jsons.h",
     "gpu_driver_bug_list.cc",
@@ skipping 66 matching lines @@
       "//third_party/libXNVCtrl",
       "//ui/gfx/x",
     ]
   } else {
     sources -= [ "gpu_info_collector_x11.cc" ]
   }
   if (!use_ozone) {
     sources -= [ "gpu_info_collector_ozone.cc" ]
   }
 }