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Enables JavaScript console logs being copied to the system log in all
XR instrumentation and browser tests. This used to be the default, but
was recently changed to be disabled by default for privacy reasons.

Bug: 956784
Change-Id: I2f417bea9149bddf168e342d4674524624628c19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585072
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Bill Orr <billorr@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Bill Orr <billorr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654566}