unit_tests failing on 2 builders

Type: build-failure

Builders failed on: 
- Mac10.10 Tests: 
  https://build.chromium.org/p/chromium.mac/builders/Mac10.10%20Tests
- Mac10.11 Tests: 
  https://build.chromium.org/p/chromium.mac/builders/Mac10.11%20Tests

417685 - 417728
https://chromium.googlesource.com/chromium/src/+log/17ad0f1ca0367fbb6d28cd9ed3d4d60a44e0e655%5E..f5d0098acc9a8167409476627eae3e91d94e8cac?pretty=fuller

Suspected CL:
https://codereview.chromium.org/2326723003