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Only include items that are relevant to component extensions in their context
menus. That is to say, don't show the "Remove", "Manage extensions", or "Inspect
popup" items, and only show the "Options" item if there is an options page.

BUG=486223

Review URL: https://codereview.chromium.org/1135763004

Cr-Commit-Position: refs/heads/master@{#329928}