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In https://chromium-review.googlesource.com/c/chromium/src/+/957645, I
accidentally introduced a crash (crbug/828814) which could occur if
content verification was running as Chrome was shutting down.

According to |KeyedServiceBaseFactory::AssertContextWasntDestroyed|,
service getting (ExtensionRegistry is a service) should only be done on
the main thread.

This CL stores the data which was read from the extensionregistry
(the extension's background scripts, page and content script file_paths)
in the ContentVerifierIOData instead.

Bug: 828814,809088
Change-Id: I7d2a326c5ea609f996bd0af2a6d490108a99e772
Reviewed-on: https://chromium-review.googlesource.com/996489
Commit-Queue: proberge <proberge@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548286}