Revert of Eliminate browser test helpers from unit tests. (patchset #15 id:280001 of https://codereview.chromium.org/1613123002/ )

Reason for revert:
Seems likely to have broken cros compile here: https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20GN%20%28dbg%29/builds/17397

Original issue's description:
> Eliminate browser test helpers from unit tests.
>
> This change eliminates dependencies of browser_test_utils.h and
> in_process_browser_test.h from unit tests and eliminates the future
> possibility of adding them back by changing gn and gyp configurations.
>
> This also renames one test from "unit" to "browser" as it seems more
> appropriate for the case.
>
> BUG=514788
>
> Committed: https://crrev.com/ce7050d878ea3cdfc8445903d00107cb2ba8b252
> Cr-Commit-Position: refs/heads/master@{#372679}

TBR=blundell@chromium.org,phajdan.jr@chromium.org,jam@chromium.org,carlosk@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=514788

Review URL: https://codereview.chromium.org/1658733002

Cr-Commit-Position: refs/heads/master@{#372685}

0 files changed, 0 insertions, 0 deletions