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This only changes debugging pages in Chrome, not general Safe Browsing
behavior.

This adds two new pages to chrome://interstitials for Loud and Quiet
Malicious Unwanted Software warnings (AKA "MUwS", "UwS", "Harmful").

R=jialiul@chromium.org

      Unwanted Software links"
      --gtest_filter=InterstitialUITest.UnwantedSoftwareInterstitial*

Bug: 729271
Test: Manual - open chrome://interstitials and click the new "Malicious
Test: out/Desktop/browser_tests \
Change-Id: Iab28f8099e184a747c7589ffda19098126d25c86
Reviewed-on: https://chromium-review.googlesource.com/1188948Reviewed-by: Jialiu Lin <jialiul@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586046}