Fixes gn-check errors with enable_plugins=false.

chrome/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/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 3046 matching lines @@
       "bookmarks/bookmark_html_writer.h",
       "certificate_viewer.h",
       "chooser_controller/chooser_controller.cc",
       "chooser_controller/chooser_controller.h",
       "chrome_browser_field_trials_desktop.cc",
       "chrome_browser_field_trials_desktop.h",
       "chrome_browser_main_posix.cc",
       "chrome_browser_main_posix.h",
       "chrome_process_singleton.cc",
       "chrome_process_singleton.h",
-      "component_updater/widevine_cdm_component_installer.cc",
-      "component_updater/widevine_cdm_component_installer.h",
       "custom_handlers/register_protocol_handler_permission_request.cc",
       "custom_handlers/register_protocol_handler_permission_request.h",
       "custom_home_pages_table_model.cc",
       "custom_home_pages_table_model.h",
       "diagnostics/diagnostics_controller.cc",
       "diagnostics/diagnostics_controller.h",
       "diagnostics/diagnostics_metrics.cc",
       "diagnostics/diagnostics_metrics.h",
       "diagnostics/diagnostics_model.cc",
       "diagnostics/diagnostics_model.h",
@@ skipping 369 matching lines @@
       "//chrome/browser/policy:path_parser",
       "//chrome/browser/profile_resetter:profile_reset_report_proto",
       "//chrome/common/importer:interfaces",
       "//components/feedback",
       "//components/web_modal",
       "//device/battery",
       "//net:net_browser_services",
     ]
   }
 
+  if (enable_pepper_cdms) {
+    sources += [
+      "component_updater/widevine_cdm_component_installer.cc",
+      "component_updater/widevine_cdm_component_installer.h",
+    ]
+  }
+
   if (!is_chrome_branded) {
     sources += [
       "search/local_files_ntp_source.cc",
       "search/local_files_ntp_source.h",
     ]
   }
 
   if (enable_vr_shell || enable_webvr) {
     if (enable_vr_shell) {
       defines += [ "ENABLE_VR_SHELL" ]
@@ skipping 1019 matching lines @@
       "media/pepper_cdm_test_constants.cc",
       "media/pepper_cdm_test_constants.h",
     ]
   }
 }
 
 service_manifest("preferences_manifest") {
   name = "preferences"
   source = "prefs/preferences_manifest.json"
 }