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This method is used in the renderer and doesn't need the hole punching
to content-internal that web_test_support_renderer was designed for.
Move it to web_test/blink_test_helpers.h.

R=nasko@chromium.org

Bug: 866140
Change-Id: I62f16e813b5eae8aa7b117c992f072b65ebf8be3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2142512Reviewed-by: Nasko Oskov <nasko@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757526}