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This CL fixes sync_wait() usage in VCD request manager. sync_wait()
returns 0 when the wait is successful. !sync_wait() is true when
the wait operation is successful.

BUG=None
TEST=Recompiled and redeployed Chrome.

Change-Id: I6737b039e0c2c7fcfd5a685784a5bc026b3d18ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638209Reviewed-by: Wei Lee <wtlee@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Auto-Submit: Jasmine Chen <lnishan@google.com>
Commit-Queue: Jasmine Chen <lnishan@google.com>
Cr-Commit-Position: refs/heads/master@{#666578}