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This CL replaces a check that was accidentally removed by:
https://chromium-review.googlesource.com/c/chromium/src/+/2422022
Specifically the lines:
    const base::FilePath dir = DetermineScanDir(profile_);
    if (dir.empty()) {
      std::move(callback).Run(std::vector<ExternalInstallOptions>());
      return;
    }

Without this check Chrome would attempt to read json files in its own
installation directory on non-Chrome OS platforms.

Bug: 1157424
Change-Id: I351ad24d13c1ce394660f74013d094adef2a02f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2585257
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836532}