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When disabled, built-in LBS deletes cache.dat on startup, even if the
LBS extension is also installed. Depending on the order things happen
in, this may cause built-in LBS to delete the extension's cache.dat
file, which is needed for IE=>Chrome switching to work correctly.

After this change, built-in LBS keeps cache.dat and sitelistcache.dat
if the extension is enabled.

Bug: 1000099
Change-Id: I2ecf2f0942fe5888da43b49927cf2734f6e4ae00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829478
Commit-Queue: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701196}