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

We wish to provide a means of optionally suppressing the display of the
webview error page so that applications that wish to display their own
error content may do so without presenting a poor user experience.

Test: run_webview_instrumentation_test_apk -f AwSettingsTest#testShouldSuppressErrorPage
Change-Id: I15c42acd7d562e7d37bb4f84d92267db49f0a55a
Reviewed-on: https://chromium-review.googlesource.com/c/1185001
Auto-Submit: Christian O. Andersson <cricke@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Commit-Queue: Christian O. Andersson <cricke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626102}