Cleanup GN BUILD files, gni's and imports.

components/view_manager/surfaces/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("//third_party/mojo/src/mojo/public/mojo_application.gni")
+import("//mojo/public/mojo_application.gni")
 
 mojo_native_application("surfaces") {
   output_name = "surfaces_service"
   sources = [
     "main.cc",
   ]
 
   deps = [
     ":lib",
     "//mojo/environment:chromium",
@@ skipping 28 matching lines @@
     "//gpu/command_buffer/client:gles2_interface",
     "//mojo/application/public/cpp",
     "//mojo/common:tracing_impl",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//third_party/mojo/src/mojo/public/c/gles2",
     "//ui/gfx/geometry",
     "//ui/mojo/geometry:interfaces",
   ]
 }