Fuchsia: Relocate fidl_library.gni to build/config/fuchsia.

fidl_library.gni will be used for targets defined outside "third_party",
so promoting the GN template to a higher level makes sense.

Change-Id: I723419be11c450ff78729320bb04f908aa486f22
Reviewed-on: https://chromium-review.googlesource.com/1089711
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#565209}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 0d16a926bfb155fcc2272bf1f906cb092ed45b1a
2 files changed