[Fuchsia] Further remove fuchsia targets from chrome/ folders

After this change, https://crrev.com/c/5120471 should be green.

The default diff is very misleading, most of the change in
chrome/test/BUILD.gn is the indentation. Selecting "ignore whitespace"
to reduce the diff. Or navigate to
https://goonlinetools.com/online-clipboard/#4293.

Bug: 1509109, 1490426
Change-Id: Ia546a928f9e92d9fc2bd247664e9024d7d2e6f16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5120922
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Zijie He <zijiehe@google.com>
Reviewed-by: David Song <wintermelons@google.com>
Cr-Commit-Position: refs/heads/main@{#1237678}