GitLab

Move embedded extension options guest view files from
chrome/browser/guest_view/extension_options/ to
extensions/browser/guest_view/extension_options. Also add a
ExtensionOptionsGuestDelegate in chrome/ to handle certain tasks, like
opening tabs and handling context menus, which cannot be run from
within extensions/.

This move makes the extension_options codebase more consistent with the
other guest views, which are organized similarly.

BUG=409316

Review URL: https://codereview.chromium.org/556563003

Cr-Commit-Position: refs/heads/master@{#294326}