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

chrome_elf/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.
 
 # Chrome elf targets (excepting tests) should only link in kernel32.
 # Please don't add dependencies on any other system libraries.
 
 import("//build/config/compiler/compiler.gni")
 import("//build/config/win/manifest.gni")
 import("//chrome/process_version_rc_template.gni")
@@ skipping 231 matching lines @@
     "/DELAYLOAD:user32.dll",
     "/DELAYLOAD:winmm.dll",
   ]
 }
 
 shared_library("blacklist_test_main_dll") {
   testonly = true
   sources = [
     "blacklist/test/blacklist_test_main_dll.cc",
     "blacklist/test/blacklist_test_main_dll.def",
+    "blacklist/test/blacklist_test_main_dll.h",
   ]
   deps = [
     ":blacklist",
     ":nt_registry",
     "//base",
     "//build/config/sanitizers:deps",
     "//chrome/install_static:install_static_util",
   ]
 }
 
@@ skipping 37 matching lines @@
 shared_library("hook_util_test_dll") {
   testonly = true
   sources = [
     "hook_util/test/hook_util_test_dll.cc",
     "hook_util/test/hook_util_test_dll.h",
   ]
   deps = [
     "//build/config/sanitizers:deps",
   ]
 }