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This CL adds ErrorPageTest ios_web_inttest for error pages. These tests
are faster than EG tests and can test is_post and is_off_the_record
arguments passed to TestWebClient. ErrorPageTestCase exists, because
it's not possible to test old implementation with ios_web_inttest
infrastructure. ErrorPageTestCase will be removed when old error pages
code is no longer supported. Tests for is_post and is_off_the_record
arguments will be added in a separate CL.

Bug: 725241
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ic06e9613c6e69a488ac734922ffc691f124bd24b
Reviewed-on: https://chromium-review.googlesource.com/1047951
Commit-Queue: Eugene But <eugenebut@chromium.org>
Reviewed-by: Danyao Wang <danyao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556915}