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Fixes msan issue warning of use of uninitialized variable.

==1066560==WARNING: MemorySanitizer: use-of-uninitialized-value

Bug: None
Test: ran unit tests with msan
Change-Id: Ia8e57144e051f639d234d9117e05c6f08236cf23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468437
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817010}