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The previous way of fetching the Closure compiler binary from [1] no
longer works (endpoint removed), and using NPM is the suggested
alternative.

[1] https://dl.google.com/closure-compiler/compiler-latest.zip

Bug: 1137293
Change-Id: I6047c760fa97e04b16258beee0dd59c78b231b32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465685
Commit-Queue: dpapad <dpapad@chromium.org>
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816489}