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http://mock.failed.request is a special testing url load which allows us to
simulate error codes. The implementation is suppose to return the error code
referenced in the query part of the request to OnComplete().

This CL moves this handling from one of the ErrorPageTests to the
URLLoaderInterceptor::Interceptor class so that it can be shared.

Bug: 776589
Change-Id: Id6da78e4a3e62b9165d2fe30876b7bbafcf0e8b0
Reviewed-on: https://chromium-review.googlesource.com/847916
Commit-Queue: Doug Turner <dougt@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526852}