Revert of Move more utility functions to arc_util.

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index a181786a6bab0fdce476cc5155a5f2c0af80f950..5576439c39dfefa44339f4496b18e82ff3e8e911 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -225,8 +225,6 @@
     "arc/arc_session_manager.h",
     "arc/arc_support_host.cc",
     "arc/arc_support_host.h",
-    "arc/arc_util.cc",
-    "arc/arc_util.h",
     "arc/auth/arc_auth_code_fetcher.h",
     "arc/auth/arc_background_auth_code_fetcher.cc",
     "arc/auth/arc_background_auth_code_fetcher.h",
@@ -1458,7 +1456,6 @@
     "accessibility/select_to_speak_event_handler_unittest.cc",
     "accessibility/spoken_feedback_event_rewriter_unittest.cc",
     "arc/arc_session_manager_unittest.cc",
-    "arc/arc_util_unittest.cc",
     "arc/downloads_watcher/arc_downloads_watcher_service_unittest.cc",
     "arc/extensions/arc_support_message_host_unittest.cc",
     "arc/fileapi/arc_content_file_system_async_file_util_unittest.cc",