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There is a bug which causes the JS logging code to emit logging lines
without file and line information.

This fix outputs the full formatted line to stdout instead.

Change-Id: Icbb10da6d5d1d1db6b749495dd358c1b87c2ae5c
Reviewed-on: https://chromium-review.googlesource.com/c/1357653Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612892}