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Use closure compiler for browser tests.

Fix compilation error for MessagePipe.sendMessage since it expect object
or undefined.

Bug: b:158566609

Change-Id: I0c3cc042d9fbfd6da801d67ac8d6f27b37ffaa48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2320593
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792666}