Add missing .h files to .gn files that have a .cc file next to it in the gn file already.

components/nacl/browser/BUILD.gn

 # Copyright 2015 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/features.gni")
 
 assert(enable_nacl)
 
 static_library("browser") {
   sources = [
@@ skipping 62 matching lines @@
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "nacl_file_host_unittest.cc",
     "nacl_process_host_unittest.cc",
     "nacl_validation_cache_unittest.cc",
     "pnacl_host_unittest.cc",
     "pnacl_translation_cache_unittest.cc",
     "test_nacl_browser_delegate.cc",
+    "test_nacl_browser_delegate.h",
   ]
 
   deps = [
     ":browser",
     "//base",
     "//components/nacl/common",
     "//content/test:test_support",
     "//net:test_support",
   ]
 
   if (is_linux) {
     sources += [ "../zygote/nacl_fork_delegate_linux_unittest.cc" ]
   }
 }