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This is a step towards doing full IWYU of browser_test.h, which will
have other benefits.

Completely mechanical and already R+ed as part of r765923.

Tbr: sky
Bug: none
Change-Id: Icb7ab728098a6cf29c0920da4b524e96a7c024c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2186411
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766361}