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Make fast/css/acid2.html and http/tests/misc/acid2.html useful, by scrolling
the test face into view, rather than showing the instructional text at the top
of the document (which basically says "click here to run the test").

There was an acid2-pixel.html alongside the acid2.html test, which I'm
removing. The idea was apparently to keep an unmodified (and useless)
acid2.html test, in addition to a useful but modified one, i.e. one that made
the test face visible without first having to scroll (by adjusting margins and
stuff). But since acid2.html has already been modified by us anyway, let's just
go all in and scroll the face into view. Also no longer dump the render tree,
since it's not useful.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ie4518d40b0376bfc7920e6789c1d13f8758b22c6
Reviewed-on: https://chromium-review.googlesource.com/958922
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542544}