Remove legacy migration code that coupled history and bookmarks.

chrome/browser/history/DEPS

 include_rules = [
   # History is being made into a Browser Component, so we have these
   # three basic rules followed by temporary exceptions.  Please don't
   # add to the list of exceptions!
   "-chrome/browser",
   "+chrome/browser/api",
   "+chrome/browser/history",
 
   # TODO(erikwright): Bring this list to zero.
   #
   # Do not add to the list of temporarily-allowed dependencies below,
   # and please do not introduce more #includes of these files.
   "!chrome/browser/autocomplete/autocomplete_field_trial.h",
   "!chrome/browser/autocomplete/autocomplete_log.h",
   "!chrome/browser/autocomplete/autocomplete_match.h",
   "!chrome/browser/autocomplete/autocomplete_provider.h",
   "!chrome/browser/autocomplete/autocomplete_result.h",
   "!chrome/browser/autocomplete/history_provider_util.h",
   "!chrome/browser/autocomplete/history_url_provider.h",
   "!chrome/browser/autocomplete/url_prefix.h",
-  "!chrome/browser/bookmarks/bookmark_codec.h",
   "!chrome/browser/bookmarks/bookmark_model.h",
   "!chrome/browser/bookmarks/bookmark_model_factory.h",
   "!chrome/browser/browser_process.h",
   "!chrome/browser/cancelable_request.h",
   "!chrome/browser/chromeos/login/existing_user_controller.h",
   "!chrome/browser/diagnostics/sqlite_diagnostics.h",
   "!chrome/browser/extensions/event_router.h",
   "!chrome/browser/extensions/extension_function.h",
   "!chrome/browser/favicon/favicon_service.h",
   "!chrome/browser/prefs/pref_service.h",
@@ skipping 17 matching lines @@
   # and please do not introduce more #includes of these files.
   '.*_[a-z]*test\.cc': [
     "!chrome/browser/bookmarks/bookmark_utils.h",
     "!chrome/browser/extensions/extension_apitest.h",
     "!chrome/browser/extensions/extension_function_test_utils.h",
     "!chrome/browser/ui/browser.h",
     "!chrome/browser/ui/browser_tabstrip.h",
     "!chrome/browser/ui/view_ids.h",
   ]
 }