Fixes gn-check errors with enable_plugins=false.

chrome/browser/ui/BUILD.gn

Index: chrome/browser/ui/BUILD.gn
diff --git a/chrome/browser/ui/BUILD.gn b/chrome/browser/ui/BUILD.gn
index 5f389f11b6f0f829d3ab5effdafeb7275cce8695..b5f72949b69bfe91ab7d1887f2697294cfd6f4ad 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -1043,8 +1043,6 @@ split_static_library("ui") {
       "webui/options/options_ui.h",
       "webui/options/password_manager_handler.cc",
       "webui/options/password_manager_handler.h",
-      "webui/options/pepper_flash_content_settings_utils.cc",
-      "webui/options/pepper_flash_content_settings_utils.h",
       "webui/options/reset_profile_settings_handler.cc",
       "webui/options/reset_profile_settings_handler.h",
       "webui/options/search_engine_manager_handler.cc",
@@ -1206,6 +1204,8 @@ split_static_library("ui") {
       "hung_plugin_tab_helper.h",
       "webui/flash_ui.cc",
       "webui/flash_ui.h",
+      "webui/options/pepper_flash_content_settings_utils.cc",
+      "webui/options/pepper_flash_content_settings_utils.h",
     ]
     deps += [ "//ppapi/proxy:ipc" ]
   }