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Historically the Closure compiler was compiled from scratch, because it was
modified to include a Chrome-specific pass. ChromePass.java has been upstreamed
to the canonical repo for a while now, so there is no need to keep building the
compiler from scratch anymore (as of r445661)

Benefits: Rolling a new Closure compiler version is now much
 - Faster (before it took a few minutes, now it takes a few seconds).
 - Easier (no more dependencies to mvn and jdk, no setup required)

Cons:
 - No automated changelog link between previous and new versions.
 - Can't pull in closure-compiler master branch anymore, instead only what's at
   https://dl.google.com/closure-compiler/compiler-latest.zip is available.

This CL also rolls a new Closure compiler version as a proof that the new
roll_closure_compiler script works.

Bug: 867683
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I19671593a32c379ce9c3fb919f889aab56d939cf
Reviewed-on: https://chromium-review.googlesource.com/1214746Reviewed-by: calamity <calamity@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590377}