Add missing dependencies to the GN build.

device/serial/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("//mojo/public/tools/bindings/mojom.gni")
 
 # GYP version: device/serial/serial.gyp:device_serial
 static_library("serial") {
   output_name = "device_serial"
 
@@ skipping 27 matching lines @@
     "serial_io_handler_win.cc",
     "serial_io_handler_win.h",
     "serial_service_impl.cc",
     "serial_service_impl.h",
   ]
 
   if (is_linux) {
     configs += [ "//build/config/linux:udev" ]
   }
 
-  deps = [
+  public_deps = [
     ":serial_mojo",
   ]
 }
 
 # GYP version: device/serial/serial.gyp:device_serial_test_util
 static_library("test_util") {
   output_name = "device_serial_test_util"
 
   sources = [
     "test_serial_io_handler.cc",
@@ skipping 12 matching lines @@
     "//extensions:extensions_renderer_resources_grit",
   ]
 
   sources = [
     "data_stream.mojom",
     "data_stream_serialization.mojom",
     "serial.mojom",
     "serial_serialization.mojom",
   ]
 }