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This CL makes it possible to use chrome://omnibox as a batch query
processing tool, transforming an input set of queries to an output
set of exports.  This is currently done by detecting the type of
import data, but the functionality can easily be wired into dedicated
UI elements if we want it to be more discoverable.

This CL also fixes a bug in generated export filenames: it was
including extra spaces due to code formatting, but now the spaces
are removed and the date/time text is shortened to the essentials.

Bug: 964528
Change-Id: I09036af82aaf9c4ade9f7dc929c338c85159e77d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614711
Commit-Queue: Orin Jaworski <orinj@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#661120}