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With this CL, WebLayer's SSL interstitials now use ContentMetricsHelper
rather than the more generic MetricsHelper. This enables them to capture
metrics about captive portal detection when that feature is enabled,
analogously to how Chrome's SSL interstitials capture these metrics.

Bug: 1030692
Change-Id: I0156ad2626304fb5fe6eb6c9e80aca92c89e31be
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2041609
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739437}