GitLab

components/ui_devtools:ui_devtools is a source_set target depended on
by chrome/browser/ui:ui and ash:ash, which just embed ui_devtools and do not
expect it to export any symbols out.

BUG=669352

Review-Url: https://codereview.chromium.org/2568003002
Cr-Commit-Position: refs/heads/master@{#438002}