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The resource strings are needed only for the setup app and unit tests. Previously they were also linked into Chrome.

This clarifies the usage and renames the targets to force you to pick (previously the naming encouraged you to link to the strings, which is probably not correct for most cases.

Review URL: https://codereview.chromium.org/1545803002

Cr-Commit-Position: refs/heads/master@{#367057}