Workaround to remove command line flag on ChromeOS.

chrome/browser/bookmarks/DEPS

 include_rules = [
   # Bookmarks is being made into a component (it will end up at
   # //components/bookmarks and not depend on //chrome), so we have these basic
   # rules followed by temporary exceptions.  Please don't add to the list of
   # exceptions!
   "-chrome/browser",
   "+chrome/browser/bookmarks",
   "+chrome/browser/browser_process.h",
   "+chrome/browser/favicon",
   "+chrome/browser/chrome_notification_types.h",
@@ skipping 16 matching lines @@
   # Do not add to the list of temporarily-allowed dependencies above,
   # and please do not introduce more #includes of these files.
 ]
 
 specific_include_rules = {
   # For unit tests, it's fine to include utility process code.
   '.*test\.cc': [
     "+chrome/test/base/testing_profile.h",
     "+chrome/utility/importer/bookmark_html_reader.h",
   ],
+  # Allow to include flags_storage into enhanced_bookmarks_features.cc because
+  # it has a function used by about_flags.cc and it needs flags_storage.
+  # This should be removed after enhanced bookmarks experiment is over.
+  'enhanced_bookmarks_features\.cc': [
+    "+chrome/browser/flags_storage.h",
+  ],
 }