GitLab

Specifically:
 - cr_searchable_drop_down_tests.js
 - cr_view_manager_tests.js
 - iron_list_focus_test.js

Also in this process, realized that cr-searchable-drop-down
was using the deprecated KeyEvent#code attribute,
and updated it to use KeyEvent#key instead.

Bug: 1000989
Change-Id: I5c421562f5ee90c5f1ea42b7cb2b1c6fd2aa31a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2289080Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786916}