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Currently SSLInfo is removed by SignedExchangeLoader::OnHTTPExchangeFound() when
kURLLoadOptionSendSSLInfoWithResponse flag is not set. So this CL changes
SignedExchangePrefetchHandler to set the flag to store the SSLInfo in
PrefetchedSignedExchangeCache. And changes InnerResponseURLLoader to clear the
SSLInfo if the request is not for main frame main resource and
report_raw_headers flag is not set.

The case of issue 998359 should be covered by
SignedExchangeRequestHandlerBrowserTest.Simple/3. But this test was not executed
as expected. The cached SXG in PrefetchedSignedExchangeCache was not correctly
used for the next navigation. So this CL changes the test to use JS to trigger
the navigation from renderer, and to use the overridden verification_time in
PrefetchedSignedExchangeCache.

Bug: 998359
Change-Id: I614d4a39bddfd55290e7ff632565ed7bf1c75229
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1771902Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691643}