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See https://crrev.com/c/1185001 for details

Design doc: https://docs.google.com/document/d/188BbgvTdhKf8bXikCL-JMduEclJOd9GxhKu79hmSVdo/edit

Test: run_webview_instrumentation_test_apk -f AwSettingsTest#testWillSuppressErrorPage
Change-Id: I71603bf906b58c9c42cb06ecf1abcee10360d5cb
Reviewed-on: https://chromium-review.googlesource.com/c/1482900
Auto-Submit: Christian O. Andersson <cricke@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634775}