Fix missing GN dependencies.

components/html_viewer/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/module_args/v8.gni")
 import("//mojo/mojo_application_package.gni")
 import("//testing/test.gni")
 import("//third_party/mojo/src/mojo/public/mojo.gni")
 import("//third_party/mojo/src/mojo/public/mojo_application.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 179 matching lines @@
     "$root_out_dir/icudtl.dat",
     "$root_out_dir/ui_test.pak",
     "$target_gen_dir/html_viewer_resources.pak",
   ]
 
   if (v8_use_external_startup_data) {
     resources += [
       "$root_build_dir/natives_blob.bin",
       "$root_build_dir/snapshot_blob.bin",
     ]
+    deps += [ "//gin" ]
   }
 }
 
 test("tests") {
   output_name = "html_viewer_unittests"
   sources = [
     "ax_provider_impl_unittest.cc",
     "discardable_memory_allocator_unittest.cc",
   ]
   deps = [
@@ skipping 14 matching lines @@
     "//base",
     "//mojo/application",
     "//mojo/application:test_support",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/mojo_services/src/accessibility/public/interfaces",
   ]
 
   data_deps = [ ":html_viewer" ]
 }