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This is to improve build throughput around js2gtest by removing
unnecessary build dependency.
Explanation of empty public is written in
https://gn.googlesource.com/gn/+/master/docs/reference.md#var_public

e.g. The number of build target for obj/chrome/test/browser_tests/profile_list_desktop_browsertest.o
reduced from 33553 to 5505 by this CL.

This dependency removal utilizes build parallelism well.

Bug: 937723
Change-Id: Ic92c80f2006578f9f43cc2e5d357809c414adfdd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505512
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638171}