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Previously, browser test binaries (e.g. browser_tests, interactive_ui_tests,
etc.) set up paths so that child processes would use Chromium Helper.app, which
matches the production process launching path. However this prevents the child
process from linking in test-only code, because it is a distinct binary from
the main test executable that acts as the browser process.

This change makes it so that the child process binary is the same as the main
test binary, which matches how other platforms behave.

Bug: 877992
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ic04f0d47726be89d953ea227b8a104dc7bb88c0f
Reviewed-on: https://chromium-review.googlesource.com/1193969
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587705}