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It will be used to replace webkit_support.*

After this change lands in Chromium, Blink will be updated to include
from blink_test_environment.h and call the "new" functions.

BUG=None
TEST=webkit_unit_tests
R=avi@chromium.org

Review URL: https://codereview.chromium.org/458013002

Cr-Commit-Position: refs/heads/master@{#288636}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288636 0039d316-1c4b-4281-b951-d872f2087c98