Content "gn check" work.

gpu/command_buffer/service/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/ui.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 group("service") {
   if (is_component_build) {
     public_deps = [
       "//gpu",
     ]
   } else {
     public_deps = [
       ":service_sources",
     ]
   }
 }
 
 source_set("service_sources") {
-  visibility = [
-    "//gpu/*",
-    "//mojo/gles2:gles2",
-  ]
+  # External code should depend on this via //gpu/command_buffer/service above
+  # rather than depending on this directly or the component build will break.
+  visibility = [ "//gpu/*" ]
 
   sources = [
     "buffer_manager.cc",
     "buffer_manager.h",
     "cmd_buffer_engine.h",
     "cmd_parser.cc",
     "cmd_parser.h",
     "command_buffer_service.cc",
     "command_buffer_service.h",
     "command_executor.cc",
@@ skipping 136 matching lines @@
     configs -= [ "//build/config/compiler:default_optimization" ]
     configs += [ "//build/config/compiler:optimize_max" ]
   }
 }
 
 proto_library("disk_cache_proto") {
   sources = [
     "disk_cache_proto.proto",
   ]
 }