Add missing header files to GN files (3 of N)

components/os_crypt/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/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//components/os_crypt/features.gni")
 
 if (use_gnome_keyring) {
@@ skipping 40 matching lines @@
     "//crypto:platform",
   ]
 
   if (is_mac || is_ios) {
     sources -= [ "os_crypt_posix.cc" ]
   }
 
   if (is_ios) {
     set_sources_assignment_filter([])
     sources += [
+      "keychain_password_mac.h",
       "keychain_password_mac.mm",
       "os_crypt_mac.mm",
     ]
     set_sources_assignment_filter(sources_assignment_filter)
   }
 
   if (is_win) {
     libs = [ "crypt32.lib" ]
   }
 
@@ skipping 105 matching lines @@
     if (use_dbus) {
       sources += [
         "key_storage_kwallet_unittest.cc",
         "kwallet_dbus_unittest.cc",
       ]
       deps += [ "//dbus:test_support" ]
       defines += [ "USE_KWALLET" ]
     }
   }
 }