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Committed Interstitial error page HTML (1/2): attach net_error and error_page_content to ThrottleCheckResult.

Changes NavigationThrottle::ThrottleCheckResult into a struct that holds a net
error and an optional error page content (i.e. HTML + inline JS/CSS). The old
ThrottleCheckResult enum is changed to ThrottleAction and included in the
struct.

TBRing jochen@ for mechanical changes.

TBR=jochen@chromium.org

Bug: 751949
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_site_isolation
Change-Id: I2b4836d1be24251704f25b05f0fd0c38bb74c341
Reviewed-on: https://chromium-review.googlesource.com/647656
Commit-Queue: Lucas Garron <lgarron@chromium.org>
Reviewed-by: Lucas Garron <lgarron@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501244}