Revert of Refactoring of Cast-related crypto code

extensions/browser/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/crypto.gni")
 import("//build/config/features.gni")
 
 # GYP version: extensions/extensions.gyp:extensions_browser
 source_set("browser") {
   sources = []
@@ skipping 501 matching lines @@
       "//components/storage_monitor",
       "//crypto:platform",
       "//device/bluetooth",
       "//device/core",
       "//device/hid",
       "//device/serial",
       "//device/usb",
       "//extensions/common/api/cast_channel:cast_channel_proto",
     ]
 
+    if (use_openssl) {
+      sources += [ "api/cast_channel/cast_auth_util_openssl.cc" ]
+    } else {
+      sources += [ "api/cast_channel/cast_auth_util_nss.cc" ]
+    }
+
     if (is_chromeos) {
       deps += [ "//chromeos" ]
       sources += [
         "api/audio/audio_service_chromeos.cc",
         "api/vpn_provider/vpn_provider_api.cc",
         "api/vpn_provider/vpn_provider_api.h",
         "api/vpn_provider/vpn_service.cc",
         "api/vpn_provider/vpn_service.h",
         "api/vpn_provider/vpn_service_factory.h",
       ]
     } else if (is_linux) {
       sources += [ "api/audio/audio_service_linux.cc" ]
     } else {
       sources += [ "api/audio/audio_service.cc" ]
     }
   }
 
   if (is_win) {
     cflags = [ "/wd4267" ]  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
   }
 }