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The web tests below are served as `file:` scheme resources, and uses
`setAllowUniversalAccessFromFileURLs(true)` to bypass all origin check.
So that they can access the URL of iframes.
 - forms/formtarget-attribute-button-html.html
 - forms/formtarget-attribute-input-2.html
 - forms/formtarget-attribute-input-html.html

This CL moves them from web_tests/fast to web_tests/http/tests, so that
they are served via http, and they can access iframes without disabling
the origin check.

Change-Id: I408ac5714d1e81adc248307a3534fb014f2811c9
Reviewed-on: https://chromium-review.googlesource.com/c/1454200Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629483}