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This CL drops the closure_compilation bot for everything except the
closure_compiler directory, since the bot only runs a Closure Compiler
test now.

Change-Id: I5f9149af0ff27ae87a294e72282e019ce926ce96
Reviewed-on: https://chromium-review.googlesource.com/c/1345790
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615801}