base::CPU::cpu_brand() should not contain NULs.

BUG=249713

Change-Id: Ic167b497acc2308c0f8222800367e13e3926c0af
Reviewed-on: https://chromium-review.googlesource.com/741547
Commit-Queue: Lei Zhang <[email protected]>
Reviewed-by: Primiano Tucci <[email protected]>
Cr-Commit-Position: refs/heads/master@{#513918}
4 files changed