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In order to incrementally split content/shell/renderer/web_test out of
content_shell_lib, into web_test_renderer, we must split apart
web_test_support.

content_shell_lib must depend on the browser-side code in
web_test_support, so we move that to web_test_support_browser. Then
the dependency on web_test_support_renderer needs only be in
the web_test_renderer target.

Without this change, any dependency on content_shell_lib would also
include web_test_support_renderer, but not web_test_renderer, which
causes a build failure due to:
1) Circular includes between web_test_support_renderer and
   web_test_renderer
2) So web_test_renderer -> web_test_support_renderer
3) But web_test_support_renderer -/-> web_test_renderer
4) This means depending on web_test_support_renderer without going
   through web_test_renderer does not link.

R=avi@chromium.org

Bug: 866140
Change-Id: If3ae301f44bd2057fb196f39e7947607bb3da60f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134858
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756341}