inspector target has header come from protocol_generated_sources in
sources. So protocol_generated_sources needs to be in public_deps.

Bug: chromium:931596
Change-Id: I3b5ea390e79549b48930b16819840e1a0f87304b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1506994
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60125}