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This requires making the TemplateURLParser be asynchronous rather than
directly returning the result. That has a ripple effect of changing the
lifetimes of some of the parameters to Parse(), such as the
SearchTermsData.

The Firefox importer also uses the TemplateURLParser (although it may
be entirely broken, per https://crbug.com/868768). The importer assumes
that all operations are synchronous, so this adds an internal helper
class to manage the now-asynchronous state for TemplateURL parsing.

Bug: 699342
Change-Id: I311d9e29dbbca34a4f5696b251a0fbaaadcc506b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879973
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Martin Barbella <mbarbella@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Kevin Bailey <krb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712773}