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

The relocation was verified using "gn gen --check".

TBR=sergeyu@chromium.org

Change-Id: Ib632e466185f77f7b4f5bc43b13439bdd28faf3c
Reviewed-on: https://chromium-review.googlesource.com/1091157Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565376}